The U.S. has urged its citizens in Ukraine to leave the country immediately, amid fears of increasing Russian attacks.
The U.S. embassy in Kiev issued a security alert on Tuesday.
It said that the Department of State had information that Russia was stepping up efforts to launch strikes against Ukraine’s civilian infrastructure and government facilities in the coming days.
Ukraine celebrates its 31st anniversary of independence from the Soviet Union on Wednesday, exactly half a year after the war began.
Ukrainian President Volodymyr Zelensky warned that Russia may mark the occasion with an increase in attacks.
The warning itself is not new. A month before the war began, on Jan. 24, U.S. citizens were told to leave the country.
In July, the U.S. issued a further warning about heavy missile attacks.
The State Department has also had a travel warning for Ukraine in place since February.