In an effort to find a diplomatic way to defuse tensions over Ukraine, the US expects to begin talks with Russia in January over Moscow's demands for broad European security guarantees.

Russia has deployed approximately 100,000 troops along its border with Ukraine, raising Western fears of an invasion. Moscow has demanded that NATO and the United States reduce their presence in eastern Europe, and Russian President Vladimir Putin warned on Tuesday that Russia was prepared to use its military against what he described as a growing threat from NATO.

Karen Donfried, US assistant secretary of state, said on Tuesday that Washington intends to hold bilateral talks with Moscow on the security proposals next month, despite widespread concern among EU and Nato member states that many of the demands are unrealistic and would weaken the western military alliance.

“We are prepared to discuss those proposals that Russia put on the table. There are some things that we are prepared to work on, and that we do believe there is merit in having a discussion,” Donfried told reporters. “There are other things in those documents that the Russians know will be unacceptable.”

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On Tuesday, Putin told a group of senior military officers that the Kremlin was "seriously concerned" about Nato deployments near the country's borders and the possibility of Ukraine possessing hypersonic weapons capable of striking Moscow in less than 10 minutes.

“If our western colleagues continue this clearly aggressive stance, we will take appropriate military-technical measures in response and react harshly to hostile steps,” Putin said, according to state newswire RIA Novosti. “And I want to stress that we are within our rights to do what is required to ensure Russia’s security and sovereignty.”

Putin's comments were his first since Russia unveiled draft security proposals, which he denied were an ultimatum but said were necessary to avert a conflict.

If approved, the draft proposals would reshape much of the post-Cold War European security order by pushing Nato back to its borders before 1997, when it began admitting former communist states in Eastern Europe.

Russia denies Western claims that it is contemplating military action against Ukraine. Putin did not define "military-technical means" or the specific context in which Russia would use them.

Putin claimed that the US was considering an armed incursion into Russian territory and that Nato expansion had cornered it. “We can’t retreat any further,” he said. “Do they really think we’ll sit idly as they create threats against us?”

Donfried stated that the US and its EU allies were "poised to move in a dramatic way" if Russia engaged in "further military aggression against Ukraine."