Russia wants the "withdrawal of foreign forces, hardware and arms" from countries that were not NATO members before 1997, the ministry said in a statement on its website.

"These include Bulgaria and Romania," the statement added, singling out the two former Warsaw Pact allies, who joined NATO in 2004.

US Secretary of State Antony Blinken and Russia's Foreign Minister Sergei Lavrov are meeting in Geneva to continue a flurry of diplomatic efforts to ease soaring tensions between Russia and the West.

Western countries accuse Russia of amassing tens of thousands of troops on the border with Ukraine and planning to invade the ex-Soviet country.

Moscow denied these claims and presented Washington and NATO with proposals aimed at curbing the eastward expansion of the military alliance in exchange for a de-escalation of tensions.

Russia's security demands included that NATO must not admit any new members -- naming in particular Ukraine and Georgia -- and a guarantee that the US will not establish new military bases in former Soviet countries.

Russia repeatedly requested a written response from Washington to their demands, which the US has largely dismissed as "non-starters".

There are around 1,000 US and 140 Italian troops stationed in Romania on a rotational basis as well as several dozen Polish troops.

Bulgaria has an agreement with the United State for the deployment of up to 5,000 troops on rotation.