Russian Defense Minister Sergei Shoigu said on Tuesday that Russia had for the first time struck Islamic State targets in Syria with missiles fired from a submarine in the Mediterranean.
"The targets were two large terrorist positions in the territory of Raqqa," Shoigu told President Vladimir Putin in a televised meeting, adding that the Calibre missiles had been fired from the submarine Rostov-on-Don.
"We can say with complete confidence that fairly serious damage was done to weapons stores and a factory for preparing mines and, naturally, oil infrastructure."
Shoigu said Russia had informed Israel and the United States in advance of its plan to launch missiles from a submarine.
He said that, over the previous three days, Russia's air force had flown more than 300 sorties over Syria and struck more than 600 targets of various types.
Russian bombers flying over Syria were being accompanied by fighter jets, as Putin had ordered, he added.