The Russians do not bluff.
They wait, but once they say they will do something... You can count on it happening.
Certainly something like this.
Russians doing he job Americans (Obama) refuses to do. Obama is more likely to send in troops to fight alongside his Muslim brothers and against the Russians.
Kerry will resort to more passive, weasel verbiage, such as “deconflict” and try to make it seem like he has a clue.