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Ukraine hit by cyber attack as U.S. questions Russian troop pullback

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Kyiv appeared to blame Russia for a cyber attack on Tuesday as U.S. President Joe Biden warned that more than 150,000 Russian troops were still amassed near Ukraine‘s borders after Moscow’s announcement of a partial pullback was met with skepticism, according to Reuters. 

The Russian defense ministry published footage on Tuesday to demonstrate it was returning some troops to base after exercises. Biden said the United States had not verified the move. „Our analysts indicate that they remain very much in a threatening position.”

Hours after Moscow’s announcement, Ukraine said the online networks of its defense ministry and two banks were overwhelmed in what is called a distributed denial-of-service. The maneuver works when hackers flood a network with unusually high volumes of data traffic to paralyze it.

Although Kyiv did not name who was behind the incident, a statement suggested it was pointing the finger at Russia.

„It is not ruled out that the aggressor used tactics of dirty little tricks because its aggressive plans are not working out on a large scale,” said the Ukrainian Centre for Strategic Communications and Information Security, which is part of the culture ministry.

Ukrainian bank Privatbank users reported problems with payments and a banking app, while Oshadbank said its systems had slowed down.

Russia’s Federal Security Service did not immediately reply to a request for comment from Reuters.

„If Russia attacks the United States or our allies through asymmetric means like disruptive cyber attacks against our companies or critical infrastructure, we’re prepared to respond,” Biden said in televised remarks from the White House.

One European diplomat said the hacking was concerning because a full military attack on Ukraine would likely be preceded by a cyber attack.

„It could mean a physical attack is imminent, or it could mean Russia is continuing to mess with Ukraine,” the diplomat said, on condition of anonymity. While such attacks are difficult to attribute, the diplomat said there was no doubt that Russia was behind them.

Western nations have suggested arms control and confidence-building steps to defuse the standoff, which has prompted them to urge their citizens to leave Ukraine because an attack could come at any time. Russia denies it has any plans to invade.