Russia had begun the invasion of Ukraine by sending tanks and armored personnel vehicles into the separatist region of Donetsk late on Monday.
Amateur video shows convoys of vehicles and tanks apparently crossing into Donetsk, the capital of one of the two separatist regions of Ukraine.
Russia said the troops would be “peacekeeping” in the breakaway regions, which it has backed since 2014. But the US said calling them peacekeepers was “nonsense”. It accused Russia of creating a pretext for war.
Ukraine’s president said his country was “not afraid of anything or anyone”.