President Joe Biden is sending about 2,000 troops from Fort Bragg, North Carolina, to Poland and Germany this week and shifting roughly 1,000 Germany-based soldiers to Romania
Biden announced the designation during a meeting with the ruling leader of Qatar at the White House on Tuesday
Russia has been building up its forces on Ukraine's borders for months and has demanded NATO pull troops and weapons from eastern Europe.
Ukraine's admission to NATO would seriously undermine relations between Russia and the alliance, Russian Foreign Minister Sergei Lavrov has said.
Russian psyche, moulded bloodily through the centuries, regards European expansionism as an existential threat
NATO Secretary-General Jens Stoltenberg also said that there is a difference between being a Nato member and being a strong and highly valued partner as Ukraine
UK PM Minister Boris Johnson tried to focus attention on the crisis with Russian troop build-up on the Ukrainian border.
The big picture must figure in strategic calculations
Though analysts believe diplomatic efforts will continue leading to a stabilisation and an eventual easing of these tensions, it may take several months for this to happen
Secretary of State Antony Blinken said the US has made no concessions to the main Russian demands over Ukraine and NATO in a written response delivered to Moscow.
Earlier in the day, White House Press Secretary Jen Psaki called a Russian invasion of Ukraine "imminent"
Germany's refusal to join other NATO members in providing weapons to Ukraine has annoyed some allies and raised questions about Berlin's resolve in standing up to Russia.
Tensions are high after Russia massed an estimated 100,000 troops in reach of its neighbour's border, surrounding Ukraine with forces from the north, east and south
NATO said Monday that it's putting extra forces on standby and sending more ships and fighter jets to eastern Europe as Russia continues its troop build-up near Ukraine.
Russia will station troops on its own territory near the Ukrainian border due to tensions with the North Atlantic Treaty Organization, Kremlin spokesman Dmitry Peskov has said
Talks between representatives of the North Atlantic Treaty Organisation (NATO) and Russia concluded without a clear outcome
NATO Secretary-General Jens Stoltenberg said both parties had expressed the need to dialogue
Senior NATO and Russian officials are meeting Wednesday to try to bridge seemingly irreconcilable differences over the future of Ukraine
North Atlantic Treaty Organizations' military commitments may prove costly for US strategic interest as Washington may be entangled in conflicts in Europe.
A Russia-NATO meeting is expected on January 12, Sputnik reported citing a news agency.