NATO websites attacked by hackers
March 16, 2014 -- Updated 0400 GMT (1200 HKT)
- NATO says some of its websites were attacked by hackers
- The attack did not affect NATO systems, a spokeswoman said
- A Ukrainian website claims responsibility for the attack
(CNN) -- Hackers apparently attacked several NATO websites Saturday, but they did not interrupt operations nor was the integrity of NATO's systems affected, NATO spokeswoman Oana Lungescu said on Twitter.
The websites were down for several hours from what's known as distributed denial-of-service attacks, she said.
CNN was unable to access at least three NATO websites hours after the NATO statement.
NATO did not say who was responsible, but a Ukrainian website claiming to belong to a group called Cyber Berkut declared in Russian that it originated the attack.
"We, Cyber Berkut, announce that today at 6:00 p.m. we started the cyberattack on NATO resources," the site proclaims
"We, Cyber Berkut, will not allow the presence NATO occupation on the territory of our homeland, because it opposes NATO intervention in Ukraine," the statement said.
The attack comes the day before a controversial vote on the secession of Crimea from Ukraine.
Cyber Berkut is a reference to the riot police known as Berkut, which was used by ousted Ukrainian President Viktor Yanukovych.
On eve of vote, Russian troops reported in Ukraine outside of Crimea
CNN team in Crimea: This is a McMoment to remember
Part of complete coverage on
August 21, 2014 -- Updated 1300 GMT (2100 HKT)
Photos illustrate the ongoing crisis in Ukraine as fighting continues to flare in the region.
August 19, 2014 -- Updated 1112 GMT (1912 HKT)
A 20-minute drive from Kiev takes you to a neighborhood that feels more like Beverly Hills than central Ukraine.
August 15, 2014 -- Updated 1416 GMT (2216 HKT)
Nearly six months since popular protests toppled Yanukovych, fighting between Ukraine's military and pro-Russia rebels continues.
August 7, 2014 -- Updated 1234 GMT (2034 HKT)
Western leaders stepped up sanctions, but the Russian President shows no sign of backing down.
August 18, 2014 -- Updated 1236 GMT (2036 HKT)
Europe's deteriorating relationship with Russia has hit its growth, even before food sanctions begin to bite.
August 4, 2014 -- Updated 1155 GMT (1955 HKT)
Despite mortar fire echoing in the distance, the international team combed through the wreckage of MH17.
July 31, 2014 -- Updated 1108 GMT (1908 HKT)
The road isn't easy -- past shelling and eerie separatist checkpoints. But where it leads is harder still.
July 31, 2014 -- Updated 1631 GMT (0031 HKT)
Future imports, exports between the EU and Russia are now banned -- but existing contracts continue.
August 5, 2014 -- Updated 0026 GMT (0826 HKT)
The Cold War aerial games of chicken portrayed in "Top Gun" are happening in real life again nearly 30 years later.
July 30, 2014 -- Updated 1510 GMT (2310 HKT)
More Russian aggression in Ukraine. More U.S. and European sanctions imposed on Moscow.
July 30, 2014 -- Updated 1206 GMT (2006 HKT)
Air accident investigators normally reach crash sites soon after a plane has gone down, what does the delay in reaching MH17 mean?
July 31, 2014 -- Updated 0001 GMT (0801 HKT)
Deadly violence, ongoing tensions and the deliberate downing of a passenger airplane. Why should Americans worry?
July 18, 2014 -- Updated 1642 GMT (0042 HKT)
The shooting down of MH17 may finally alert Washington and Europe to the danger of the conflict in Ukraine.
July 24, 2014 -- Updated 2304 GMT (0704 HKT)
The United States and its allies are angrier at Russia now over Ukraine, but will they do anything more about it?
The U.S. releases satellite images it says shows the Russian military has fired across its border with Ukraine.
July 20, 2014 -- Updated 1540 GMT (2340 HKT)
Some contend that larger weapons have come into Ukraine from Russia.
August 1, 2014 -- Updated 2037 GMT (0437 HKT)
Information about Ukraine, the second-largest European country in area after Russia.
July 27, 2014 -- Updated 1725 GMT (0125 HKT)
Ukraine's Foreign Minister Pavlo Klimkin on securing the MH17 crash site and negotiating with the separatists.
Learn more about the victims, ongoing investigation and the Russia-Ukraine conflict.
July 24, 2014 -- Updated 0700 GMT (1500 HKT)
When passengers boarded Malaysia Airlines Flight 17 last week, they couldn't have known they were about to fly over a battlefield.
July 23, 2014 -- Updated 0925 GMT (1725 HKT)
The downing Malaysia Airlines Flight 17 put the pro-Russia rebels operating in Ukraine's eastern region center stage.
July 28, 2014 -- Updated 0121 GMT (0921 HKT)
Increased fighting around the MH17 crash scene blocks international investigators. CNN's Kyung Lah reports.
July 22, 2014 -- Updated 1600 GMT (0000 HKT)
In the tangled aftermath of the disaster, two narratives emerge -- one from most of the world subscribes to, and another from Russia.
Today's five most popular stories