On Thursday, the Kremlin gave a pessimistic assessment of Russia's security discussions with the US and NATO this week, calling them "unsuccessful" and saying there were significant disagreements on fundamental issues.

Dmitry Peskov, a Kremlin spokesperson, also claimed that a sweeping sanctions bill unveiled by US Senate Democrats was seen "very negatively" by Moscow, and that its timing made it appear as an attempt to put pressure on Moscow.

Peskov said that while the two rounds of discussions between Russia and the West so far this week have yielded some "positive nuances," but Moscow is looking for concrete results, not nuances.

The discussions, which moved to Vienna on Thursday for a conference of the Organisation for Security and Cooperation in Europe, are centred around a slew of security demands made by Moscow of the West as it builds up forces near Ukraine.

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If Russia engages in hostilities against Ukraine, the proposed sanctions legislation, backed by the White House, would target top Russian government and military officials, including President Vladimir Putin, as well as key banking institutions. 

According to Peskov, placing sanctions on Putin would be equal to severing ties between Moscow and Washington.

"We regard the appearance of such papers and statements as extremely negative in light of an ongoing set of, albeit unsuccessful, negotiations," Peskov said.

Moscow is seeking a slew of security guarantees from the West, including legally binding assurances that NATO will never accept former Soviet Ukraine as a member and that the alliance will withdraw troops from former Communist states in central and eastern Europe that joined the alliance after the Cold War.

The US has dismissed these demands as "non-starters," but Washington and NATO have stated that they are open to speak with Russia about arms control, missile deployments, and confidence-building measures.