Russia says it is in high-level contact with U.S. over Ukraine -Ifax

Russian deputy Foreign Minister Sergei Ryabkov meets with U.S. special envoy Marshall Billingslea in Vienna
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MOSCOW (Reuters) -Russia said on Monday it was in high-level contact with the United States about tensions over Ukraine and dismissed fears of a Russian military buildup even as it vowed to respond to new Ukrainian sanctions.

U.S. President Joe Biden used a first phone call with Ukraine's President Volodymyr Zelenskiy on Friday to offer "unwavering" support after Western nations and NATO voiced concern over Russian troop movements near Ukraine.

There has been a recent spike in violence in Ukraine's eastern Donbass region where Kyiv's troops have battled Russian-backed separatist forces in a conflict it estimates has killed 14,000 people since 2014.

"We are in contact with the Americans, this is happening at a high level," Russia's Deputy Foreign Minister Sergei Ryabkov was quoted as saying by Interfax news agency.

He said Moscow had rejected as "unfounded" concerns raised by Washington over the situation. He accused Ukraine of failing to implement agreements over the region.

"If our American colleagues were concerned about this, it would really help stabilise the situation," he was quoted as saying.

Ukraine, Western countries and NATO accuse Russia of sending troops and heavy weapons to prop up proxies in Donbass who seized a swathe of eastern Ukraine in 2014. Russia says it provides only political and humanitarian support to separatist fighters in what it casts as an internal conflict.

Ukraine over the weekend targeted several Russian companies with sanctions as part of what it said was a clamp-down on smuggling.

On Monday, the Kremlin said Moscow would respond to those sanctions. It also said it was up to Moscow to move its military around in Russia as it saw fit and that those movements posed no threat to Kyiv.

(Reporting by Vladimir Soldatkin; Writing by Alexander Marrow and Tom Balmforth; Editing by Alison Williams and Dan Grebler)