Video has emerged showing the launch of cruise missiles from a vessel located off the coast of Crimea, just west of the city of Sevastopol.
The video, which has been geolocated by CNN, shows the missiles heading toward Ukraine.
"It’s clear there’s a ship standing out there in the distance," says a man's voice, speaking in Russian. "It's firing something, but where, you can't see."
Pentagon spokesperson John Kirby said in a briefing Monday that the US has "seen increased naval activity in the northern Black Sea."
"We have indications that some of the bombardment around Odesa is coming from the sea from surface combatants. I couldn't tell you exactly what munitions and how many and what they're hitting," he said.