Ok, ISIS is advancing in Syria in deep and the distance from the coast is becoming more and more little. The Russian naval base at Tartus [or Tartous, depending on the spelling you prefer] is entering in the range of action of the Caliph's army. What are the warriors of the Islamic State going to do? Will they, in your opinion, seize the Russian base forcing Russian personnel to escape? The alternative would be to be beheaded ... you know ... Or what?