Russia said on Tuesday its submarine deployed in the Mediterranean fired three ballistic missiles to destroy a command post of the Islamic State group in Syria's eastern Deir Ezzor province, News 24 reports.
"A missile strike with three Kalibr missiles destroyed a command post with large numbers of militants and armed vehicles and also a large weapons and ammunition depot," the Russian defence ministry said in a statement posted on Facebook.
It said the strikes targeted the area around the town of Abu Kamal, one of the few remaining urban strongholds of IS in Syria.
The ministry added it could confirm "the destruction of all the given targets."
It posted a video on Twitter of a missile blasting out of the sea.