The United States ordered family members of government employees at the country's embassy in Kyiv to leave amid increased fears that Russia could invade Ukraine.
The State Department also authorised the departure of some embassy employees who wish to leave Ukraine.
"We are continuing to pursue the path of diplomacy, but if Russia chooses further escalation, then the security conditions, particularly along Ukraine’s borders in Russia-occupied Crimea, in Russia-controlled eastern Ukraine...can deteriorate with little notice," a senior State Department official told reporters, according to a transcript of the call.
"I just want to be clear that these are prudent precautions that in no way undermine our support for or commitment to Ukraine," the official added later.
The US and its allies have increasingly warned over the last few weeks that Russia could invade the neighbouring country after amassing 100,000 troops at Ukraine's border.
The United Kingdom's foreign office said in a statement on Saturday that they had information indicating Russia was "looking to install a pro-Russian leader in Kyiv as it considers whether to invade and occupy Ukraine."
The foreign office said that Ukrainian MP Yevheniy Murayev was a possible candidate. The Russian foreign ministry dismissed the UK statement as "nonsense".
The US and EU have called for Russia to de-escalate tensions by drawing down its troops on the Ukrainian border.
US Secretary of State Antony Blinken spoke with his Russian counterpart Sergey Lavrov in Geneva on Friday, a day after warning of "massive consequences" in the event of any Russian military incursion into Ukraine.
Russia began building up more troops at the Ukrainian border in November after a similar move in March 2021.
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