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
Today's five most popular stories
Part of complete coverage on
October 3, 2014 -- Updated 0751 GMT (1551 HKT)
Reza Sayah looks into why thousands of Ukrainians have left their old lives to volunteer to fight.
October 14, 2014 -- Updated 2048 GMT (0448 HKT)
CNN's Ralitsa Vassileva speaks to The New Republic's Linda Kinstler about Putin's motives with Ukraine and China.
September 24, 2014 -- Updated 1436 GMT (2236 HKT)
President Barack Obama speaks at the 69th session of the United Nations General Assembly.
September 9, 2014 -- Updated 1258 GMT (2058 HKT)
Malaysia Airlines Flight 17 broke apart in the air after it was hit by a burst of "high-energy objects" from outside, a preliminary report by Dutch aviation investigators said Tuesday.
September 9, 2014 -- Updated 1134 GMT (1934 HKT)
"There were many scenes that defied logic," writes OSCE spokesman Michael Bociurkiw, who was one of the first international observers to arrive at the site.
September 3, 2014 -- Updated 1611 GMT (0011 HKT)
On a country road in eastern Ukraine, a scene of bucolic tranquility was suddenly interrupted by the aftermath of carnage.
September 2, 2014 -- Updated 2019 GMT (0419 HKT)
In the city of Donetsk, the devastation wrought by weeks of fighting between pro-Russia rebels and Ukrainian forces is all too apparent.
September 1, 2014 -- Updated 0000 GMT (0800 HKT)
CNN's Diana Magnay reports from the front lines in the Ukrainian conflict.
September 1, 2014 -- Updated 1126 GMT (1926 HKT)
A few miles south of the town of Starobeshevo in eastern Ukraine, a group of men in uniform is slumped under a tree.
August 23, 2014 -- Updated 1343 GMT (2143 HKT)
A shopkeeper's mutilated body, relatives' anguish, homes destroyed ... this is Donetsk.
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.
November 20, 2014 -- Updated 1412 GMT (2212 HKT)
Photos illustrate the ongoing crisis in Ukraine as fighting continues to flare in the region.
July 31, 2014 -- Updated 1631 GMT (0031 HKT)
Future imports, exports between the EU and Russia are now banned -- but existing contracts continue.
July 20, 2014 -- Updated 1540 GMT (2340 HKT)
Some contend that larger weapons have come into Ukraine from Russia.
Learn more about the victims, ongoing investigation and the Russia-Ukraine conflict.
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.