From Zero Hedge:

Uttering the loudest warning yet that any US-coalition airstrikes would be met with a Russian response, the Russian Defense Ministry said that any airstrike or missile hitting targets in territory controlled by the Syrian government would put Russian personnel in danger, clarifying that “members of the Russian Reconciliation Center in Syria are working on the ground delivering aid and communicating with a large number of communities in Syria.”

“Therefore, any missile or air strikes on the territory controlled by the Syrian government will create a clear threat to Russian servicemen.”

 “Russian air defense system crews are unlikely to have time to determine in a ‘straight line’ the exact flight paths of missiles and then who the warheads belong to. And all the illusions of amateurs about the existence of ‘invisible’ jets will face a disappointing reality,”  Konashenkov added.