"Out of an abundance of caution, the embassy will be closed, and embassy employees are being instructed to shelter in place," the department said in a statement published on the website of the US embassy in Kyiv.
"The US Embassy recommends US citizens be prepared to immediately shelter in the event an air alert is announced."
The warning comes a day after Ukraine used US ATACMS missiles to strike Russian territory, taking advantage of newly granted permission from the outgoing administration of US President Joe Biden on the war's 1,000th day.
Russia had been warning the West for months that if Washington allowed Ukraine to fire US, British, and French missiles deep into Russia, Moscow would consider those NATO members to be directly involved in the war in Ukraine.
Russian President Vladimir Putin said in October that Moscow would respond to Ukraine's strikes with US-made weapons deep into Russia.
MP/
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