They say they struck IS targets. 26 Klub land attack cruise missiles from a frigate and corvettes in the Caspian Sea. Which is interesting, because to get to Syria, they have to overfly some other countries. Did Russia give prior notice of the overflight? Did they work to deconflict the airspace? Or did they just shoot, and expect everyone else to just deal?
The Klub missile is basically a Russian clone of our Tomahawk missile.