MOSCOW (Reuters) - The Russian frigate Admiral Essen fired Kalibr cruise missiles at Islamic State targets near the Syrian city of Deir al-Zor on Tuesday to help a Syrian army offensive in the area, the Russian Defence Ministry said.  The strike, which was launched from the Mediterranean,  destroyed command and communications posts, as well as ammunition depots, a facility to repair armored vehicles, and a large group of militants, the ministry said. The strike had targeted Islamic State fighters from Russia and the former Soviet Union, it added.     