"The Department of State has information that Russia is stepping up efforts to launch strikes against Ukraine’s civilian infrastructure and government facilities in the coming days," the embassy said in a statement posted on its website on Monday.
"Russian strikes in Ukraine pose a continued threat to civilians and civilian infrastructure," it warned.
"The U.S. Embassy urges U.S. citizens to depart Ukraine now using privately available ground transportation options if it is safe to do so," the statement said.
It added that "the security situation throughout Ukraine is highly volatile and conditions may deteriorate without warning."
US President Joe Biden on Monday condemned Russia’s missile strikes on cities across Ukraine, including the capital Kyiv, saying they demonstrated the "utter brutality" of Vladimir Putin’s "illegal war on the Ukrainian people."
Russia on Monday fired dozens of cruise missiles on Kyiv and some 20 other cities throughout the country, including Lviv, Dnipro, Zaporizhzhia and Kharkiv, news outlets reported.
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Source: IAR, PAP, usembassy.gov