Members of the Free Syrian Army react as they fire a homemade rocket toward regime forces in Deir al-Zor on Sunday, June 16. Tensions in Syria flared in March 2011 during the onset of the Arab Spring, escalating into an ongoing civil war. View the most compelling images taken since the start of the conflict.
(CNN) -- Syrian rebel fighters said Friday they have captured a strategic northern military base used by the government to bomb opposition strongholds.
Rebel fighters and militants from various Islamic groups, including the jihadist al-Nusra Front, took part in the offensive, an opposition spokesman said.
They've seized control of buildings, ammunition and military equipment at the base in Idlib province, the opposition said, signaling a major blow to President Bashar al-Assad's forces.
"They are taking credit now for having taken the air base," U.S. State Department spokeswoman Victoria Nuland told reporters Friday. "And, as you know, we consider this significant on two fronts.
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"First of all, to ground some of the air assets of the Assad regime that they've been using against civilians. And, secondly, to break their ability to resupply in the north."
Read more: Pentagon weighs how to secure Syria's chemical weapons
The strategic base has been used by government forces to send explosives to areas in the north, according to the opposition Syrian Observatory for Human Rights.
In addition to housing about government 400 soldiers, the group said, warplanes that attack the region were taking off from there.
"The Taftanaz air base has been completely liberated," said Hamza Abu Hussam, a spokesman for the Binnish Coordination Committee, a local opposition group. "I went down to see with my own eyes and was able to get in."
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In a video posted on YouTube, opposition forces from various groups cheer and chant "God is great," purportedly after they took over the military airport.
CNN cannot independently verify the authenticity of the video.
Brahimi: No military solution
The U.N. and Arab League special envoy to Syria stressed Friday that there is "no military solution" to the brutal civil war being fought in the Arab nation.
Lakhdar Brahimi made the remark after meeting with Russian Deputy Foreign Minister Mikhail Bogdanov and U.S. Deputy Secretary of State William Burns at the United Nations offices in Geneva, Switzerland.
"We are all very, very deeply aware of the immense suffering of the Syrian people which has gone for far too long. And we all stressed the need for a speedy end to bloodshed, the destruction, and all forms violence in Syria," he said. "We stressed again, in our view, there is no military solution to this conflict."
Syria accused Brahimi of bias Thursday, casting a shadow on efforts to end a war that, according to the United Nations, has killed more than 60,000 people in nearly two years.
Brahimi has "deviated from the essence of his mission and clearly unveiled his bias to circles known for conspiring against Syria and the interests of the Syrian people," Syrian state media reported.
The statement from Damascus was a response to a BBC interview in which Brahimi in effect called on al-Assad to resign. He said the president would have no place in the transition to a post-conflict Syria.
"I think what people are saying is, a family ruling for 40 years is a little bit too long," Brahimi said, according to the interview Thursday.
Al-Assad took over from his late father, who seized power in 1970 and ruled for three decades.
Brahimi said both the United States and Russia want to help end the war and forge a future. The United States long has called for al-Assad to resign. Russia, which historically has had close ties with Syria, has blocked tough action against the government in the U.N. Security Council.
"I'm absolutely certain the Russians are as preoccupied as I am, as Americans are, by the bad situation that exists in Syria and its continuing deterioration, and I'm absolutely certain they would like to contribute to its solution," he said.
He cited the "absolute necessity" for pushing for a peaceful solution.
"It is the wider international community," he said, particularly Security Council members, who "can really create the opening that is necessary to start effectively solving the problem."
Securing chemical weapons
The escalating conflict and the president's efforts to retain his grip on power have sparked a push to ensure that chemical weapons are secure.
U.S. officials say they are working with nations in the Middle East to secure Syria's chemical and biological weapons sites.
"We're not talking about ground troops, but it depends on what ... happens in a transition," Defense Secretary Leon Panetta said Thursday.
Asked whether he had ruled out putting U.S. troops in Syria to secure such weapons, Panetta said: "You always have to keep the possibility that, if there is a peaceful transition and international organizations get involved, that they might ask for assistance in that situation. But in a hostile situation, we're not planning to ask for that."
Russian navy holding exercises off Syria's coast
Ships of the Russian Black Sea Fleet are heading to the eastern Mediterranean for exercises, the Russian Defense Ministry said.
A tactical group of Black Sea Fleet warships, headed by the cruiser Moskva, will undertake exercises in the eastern sector of the Mediterranean Sea. The tanker Ivan Bubnov has fueled the ships, and emergency drills have been carried out for the upcoming exercises. The tanker filled up on fuel and water Thursday at the Cyprus port of Larnaka.
A Baltic Fleet group consisting of the patrol vessel Yaroslav Mudry and tanker Lena will head for the eastern Mediterranean, where the two ships will practice stores transfers at sea. The patrol vessel will carry out anti-submarine warfare drills.
Russia has a maintenance naval base at Tartus on the coast.
No let-up in refugee flight
The United Nations said Friday that more than 612,000 people have been registered as Syrian refugees or are "being assisted as such."
There were 194,769 in Lebanon, 176,569 in Jordan, 153,163 in Turkey, 69,282 in Iraq, 13,292 in Egypt and 5,059 elsewhere in North Africa, the U.N. refugee agency said.
"Even with the winter preparation work that has been done in recent months, many refugees in both camp and noncamp situations are facing particularly cold and damp conditions. At the same time, there has been no let-up in the numbers of people fleeing Syria into neighboring countries," the U.N. High Commissioner for Refugees said.
Mia Farrow to meet refugees
Actress and UNICEF goodwill ambassador Mia Farrow will visit Lebanon next week to meet with Syrian refugees, the organization said Friday.
"As part of her mission she will appeal for additional international assistance as the needs and numbers of those fleeing Syria continue to rise," UNICEF said.
Farrow will travel to two locations near the Syrian border to meet with refugees and host families. "Ms. Farrow will also help distribute winter clothing while there as many of the refugees fled Syria with very few belongings."
Brutal winter weather is making dire conditions even more so in parts of the Middle East, especially for thousands of Syrian refugees enduring frigid temperatures in tents.
More deaths
The Syrian crisis started in March 2011, when peaceful protesters demanding democracy and reforms were met by a fierce government crackdown, which spiraled into an armed opposition movement and a civil war.
At least 106 people were killed Friday, the opposition Local Coordination Committees of Syria said. Among them were 40 people killed in shelling by artillery and jet fighters in Hasaka province, in the northeastern part of the country.
Read more: By the numbers: Syria deaths
CNN's Joe Sterling and Saad Abedine reported from Atlanta. CNN's Alla Eshchenko in Moscow and Faith Karimi in Atlanta contributed to this report.
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Syrian rebels leave their position in the northwestern town of Maaret al-Numan on Thursday, June 13. The White House said that 
Forces loyal to Syrian President Bashar al-Assad are seen near Qusayr on Thursday, May 30.
Syrian rebels take position in a house during clashes with regime forces in the old city of Aleppo on May 22.
Syrian army soldiers take control of the village of Western Dumayna north of the rebel-held city of Qusayr on Monday, May 13. Syrian troops captured three villages in Homs province, allowing them to cut supply lines to rebels inside Qusayr town, a military officer told AFP.
Rebel fighters fire at government forces in the northern Syrian city of Aleppo on Sunday, May 12.
Searchers use a flashlight as they look for survivors among the rubble created by what activists say was a missile attack from the Syrian regime, in Raqqa province, Syria, on April 25.
A Kurdish fighter from the "Popular Protection Units" (YPG) takes position inside a building in the majority-Kurdish Sheikh Maqsood area of Aleppo, on Apri. 21.
People walk past destroyed houses in the northern Syrian town of Azaz on Sunday, April 21.
Free Syrian Army fighters take positions prior to an offensive against government forces in the Khan al-Assal area, near Aleppo on Saturday, April 20.
Men inspect damage at a house destroyed in an airstrike in Aleppo on April 15.
Syrian and Kurdish rebel fighters walk in the Sheikh Maqsud district of Aleppo on April 14.
A female rebel monitors the movement of Syrian government forces in Aleppo's Sheikh Maqsud neighborhood on April 11.
A rebel runs to avoid sniper fire from Syrian government forces in Aleppo on Thursday, April 11.
Syrian rebels observe the movement of Syrian government forces around Al-Kendi hospital in Aleppo on Wednesday, April 10.
Rescue teams and security forces check out the scene of a deadly car bomb explosion in Damascus on April 8.
The fighting has taken a toll on buildings in Aleppo's Saladin district, seen here on April 8.
A Syrian rebel runs for cover in Deir ez-Zor on April 2.
A rebel checks for snipers across the street toward the Citadel in Aleppo, Syria, on Saturday, March 30, in this photo taken by iReporter Lee Harper.
A Free Syrian fighter mourns the death of a friend in Aleppo on March 30, in this photo taken by iReporter Lee Harper.
A Syrian opposition fighter runs for cover from Syrian army snipers in Aleppo on Wednesday, March 27.
A Syrian girl covers her face to protect herself from fumes as a street covered with uncollected garbage is fumigated in Aleppo on Sunday, March 24.
A Syrian man and his family drive past damaged buildings in Maarat al-Numan, on Wednesday, March 20.
Syrians carry the body of a Syrian army soldier during a funeral ceremony in Idlib province on Tuesday, March 19.
Syrian rebels take position in Aleppo, the largest city in the country, on March 11.
Syrian men search for their relatives amongst the bodies of civilians executed and dumped in the Quweiq River on March 11.
A Free Syrian Army fighter looks back as smoke rises during fighting between rebel fighters and forces loyal to Syria's President Bashar al-Assad on the outskirts of Aleppo on Saturday, March 2.
Residents read Shaam News newspapers published by the Free Syrian Army in Aleppo on March 2.
A member of the Free Syrian Army reacts to the death of a comrade who was killed in fighting, at Bustan al Qasr cemetery in Aleppo on Friday, March 1.
A rebel fighter throws a home-made grenade at Syrian government forces in Aleppo on February 16.
A member of the Free Syrian Army stands with his weapon as he looks at a rainbow in Aleppo on February 16.
A Syrian woman looks through a bus window in Aleppo on February 14.
Free Syrian Army fighters walk through a dust-filled stairwell in Damascus on February 7.
A Syrian rebel gestures at comrades from inside a broken armored personnel carrier in Al-Yaqubia on February 6.
A rebel fighter throws a hand grenade inside a Syrian Army base in Damascus on February 3.
People stand in the dust of a building destroyed in an airstrike in Aleppo, Syria on February 3.
Free Syrian Army fighters run as they enter a Syrian Army base during heavy fighting in the Arabeen neighborhood of Damascus on February 3.
An unexploded mortar shell fired by the Syrian Army sits lodged in the ground in Damascus on January 25.
Fighters from Fateh al Sham unit of the Free Syrian Army fire on Syrian Army soldiers at a check point in Damascus on January 20.
A Free Syrian Army fighter walks between buildings damaged during Syrian Air Force strikes in Damascus on January 19.
A Syrian rebel fighter tries to locate a government jet fighter in Aleppo on January 18.
Syrian rebels launch a missile near the Abu Baker brigade in Albab on January 16.
A Syrian boy walks near rubbish next to tents at a refugee camp near the northern city of Azaz on the Syria-Turkey border, on January 8.
Syrians look for survivors amid the rubble of a building targeted by a missile in Aleppo on January 7.
A father reacts after hearing of a shelling by forces loyal to Syria's President Bashar al-Assad in Aleppo on January 3.
A patient smokes a cigarette at Dar Al-Ajaza psychiatric hospital in Aleppo on December 18, 2012. The psychiatric ward, housing around 60 patients, has lacked the means to function properly since fighting broke out there in July.
Syrians mourn a fallen rebel fighter at a rebel base in the al-Fardos area of Aleppo on December 8.
Members of Liwa (Brigade) Salahadin, a Kurdish military unit fighting alongside rebel fighters, monitor the area in the besieged district of Karmel al-Jabl in Aleppo on December 6.
A member of Liwa Salahadin aims at a regime fighter in the besieged district of Karmel al-Jabl in Aleppo on December 6.
Two young boys sit underneath a washline in a refugee camp on the border between Syria and Turkey near Azaz on December 5.
The bodies of three children, who were allegedly killed in a mortar shell attack that landed close to a bakery in Aleppo, on December 2, are laid out for identification by family members at a makeshift hospital at an undisclosed location of the city.
Smoke rises in the Hanano and Bustan al-Basha districts in Aleppo on December 1 as fighting continues through the night.
Damaged houses in Aleppo are seen after an airstrike on November 29.
A Syrian rebel mourns the death of a comrade in Maraat al-Numan on November 20.
Syrians protesters stand on Assad's portrait during an anti-regime demonstration in Aleppo on November 16.
A Syrian rebel takes cover during fighting against Syrian government forces in Aleppo on November 15.
Syrian opposition fighter Bazel Araj, 19, sleeps next to his pistol in Aleppo on November 11.
A rebel fighter fires at a Syrian government position in Aleppo on November 6.
A Syrian rebel leaps over debris left in the street while running across a "sniper alley" near the Salahudeen district in Aleppo on November 4.
Rebels hold their position in the midst of a battle on November 3 in Aleppo.
A man cries while being treated in a local hospital in a rebel-controlled area of Aleppo on October 31.
A man is treated for wounds after a government jet attacked the Karm al-Aser neighborhood in eastern Aleppo on October 31.
A Syrian rebel interrogates a handcuffed and blindfolded man suspected of being a pro-regime militiaman in Aleppo on October 26.
Smoke rises from a fuel station following a mortar attack as Syrian women walk on a rainy day in the Arqub neighborhood of Aleppo on October 25.
A Syrian rebel fires at an army position in the Karm al-Jabal district of Aleppo on October 22.
A wounded Syrian boy sits on the back of a truck carrying victims and wounded people to a hospital following an attack by regime forces in Aleppo on October 21.
A man lies on the ground after being shot by a sniper for a second time as he waits to be rescued by members of the Al-Baraa Bin Malek Battalion, part of the Free Syria Army's Al-Fatah brigade, in Aleppo on October 20.
Syrian army soldiers run for cover during clashes with rebel fighters at Karam al-Jabal neighborhood of Aleppo on October 20.
Smoke rises after a Syrian Air Force fighter jet fired missiles at the suburbs of the northern province of Idlib on October 16.
A Syrian opposition fighter stands near a post in Aleppo on October 11.
A Syrian man mourns the death of his father, who was killed during a government attack in Aleppo on October 10.
A rebel fighter is carried by his friends and laid on a gurney to be treated for gunshot wounds sustained during heavy battles with government forces in Aleppo on October 1.
Syrian rebels help a wounded comrade to an Aleppo hospital after he was injured in a Syrian army strike on September 18.
Free Syria Army fighters are reflected in a mirror they use to see a Syrian Army post only 50 meters away in Aleppo on September 16.
A Syrian man carrying grocery bags tries to dodge sniper fire as he runs through an alley near a checkpoint manned by the Free Syria Army in Aleppo on September 14.
A woman walks past a destroyed building in Aleppo on September 13.
Free Syrian Army fighters battle during street fighting against Syrian army soldiers in Aleppo on September 8.
A Syrian man wounded by shelling sits on a chair outside a closed shop in Aleppo on September 4.
A woman sits in her wheelchair next to her house, damaged by a Syrian air raid, near Homs on August 26.
Members of the Free Syrian Army clash with Syrian army soliders in Aleppo's Saif al-Dawla district on August 22.
A man mourns in front of a field hospital on August 21 in Aleppo.
Wounded civilians wait in a field hospital after an air strike on August 21 in Aleppo.
People pray during the funeral of a Free Syrian Army fighter, Amar Ali Amero, on August 21.
A man cries near the graves of his two children killed during a recent Syrian airstrike in Azaz on August 20.
A Syrian woman holds her dead baby as she screams upon seeing her husband's body being covered following an airstrike by regime forces on the town of Azaz on August 15.
A Syrian rebel runs in a street of Selehattin during an attack on the municipal building on July 23.
Syrian rebels hunt for snipers after attacking the municipality building in the city center of Selehattin on July 23.
Members of the Free Syrian Army's Mugaweer (commandos) Brigade pay their respects in a cemetery on May 12 in Qusayr.
Syrian rebels take position near Qusayr on May 10.
A Free Syrian Army member takes cover in underground caves in Sarmin on April 9.
Rebels prepare to engage government tanks that advanced into Saraquib on April 9.
Men say prayers during a ceremony in Binnish on April 9.
A young boy plays with a toy gun in Binnish on April 9.
A Free Syrian Army rebel mounts his horse in the Al-Shatouria village near the Turkish border in northwestern Syria on March 16, a year after the uprising began.
Syrian refugees walk across a field before crossing into Turkey on March 14.
A rebel takes position in Al-Qsair on January 27.
A protester in Homs throws a tear gas bomb back towards security forces, on December 27, 2011.
A man stands under a giant Syrian flag outside the Umayyad Mosque in Damascus on December 24, 2011.
A member of the Free Syrian Army looks out over a valley in the village of Ain al-Baida on December 15, 2011.
Members of the Free Syrian Army stand in an valley near the village of Ain al-Baida, close to the Turkish border, on December 15, 2011.
Displaced Syrian refugees walk through an orchard adjacent to Syria's northern border with Turkey on June 14, 2011, near Khirbet al-Jouz.
A Syrian man holds up a portrait of President Bashar al-Assad during a rally to show support for the president in Damascus on April 30, 2011.
Syrians rally to show their support for President Bashar al-Assad in Damascus on April 30, 2011.
A screen grab from YouTube shows thick smoke rising above as Syrian anti-government protesters demonstrate in Moaret Al-Noman on April 29, 2011.
A screen grab from YouTube shows Syrian anti-government protesters run for cover from tear gas fired by security forces in Damascus on April 29, 2011, during the "Day of Rage" demonstrations called by activists to put pressure on al-Assad.
Syrians wave their national flag and hold portraits of al-Assad during a rally to show their support for their leader in Damascus on March 29, 2011.
A woman sits by the hospital bed of a man allegedly injured when an armed group seized rooftops in Latakia on March 27, 2011, and opened fire at passers-by, citizens and security forces personnel according to official sources.
Syrian protesters chant slogans in support of al-Assad during a rally in Damascus on March 25, 2011.
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