Russia have many new types missiles. Why do you think, that Russia not sell Syria himself SSM instead export version? Export version have limit range is 300 kilometers. But in Tartus we have Russian naval base. And for defend this base Russia can have himself missiles and submarines in mediterranian sea. As I understand, in case attack against Syria Russia use himself weapons if any start any attack against our base.

For stop USA need sunk 1-2 US carriers.