The missiles destroyed heavy equipment and killed fighters that Islamic State had transferred from its stronghold, Raqqa, to Palmyra, the Russian Defense Ministry has said.
The Russian warships, a frigate named Admiral Essen and submarine named Krasnodar, fired Kalibr cruise missiles on combat vehicles and militants outside the Syrian city of Palmyra, the Defense Ministry said.
The four cruise missiles were fired from the eastern Mediterranean, it noted in a statement. The submarine fired its missiles while submerged.