Tells US citizens to be prepared to immediately shelter in event air alert is announced

Nov. 20 (UPI) -- The U.S. Embassy in Kyiv closed on Wednesday after receiving "specific information of a potential significant air attack," it said, as the Kremlin warned it would retaliate after the Biden administration reportedly permitted Ukraine to strike deeper within Russia.

The U.S. Embassy in Kyiv, Ukraine, has released a warning stating that they have "specific information of a potential significant air attack" taking place on Wednesday, Nov. 20.

The U.S. and some other Western embassies in Kyiv said that they would stay closed Wednesday for security reasons, with the American delegation saying it had received a warning of a potentially significant Russian air attack on the Ukrainian capital. The precautionary step came after Russian officials promised a response to President Joe Biden’s decision to let Ukraine strike targets on Russian soil with U.S.-made missiles — a move that angered the Kremlin.

'The U.S. Embassy in Kyiv has received specific information of a potential significant air attack on November 20,' it said in a message on its website.