Only if they're on a suicide mission, because if that ever happened "the Motherland" would cease to exist in under an hour. Literally.
The Russians are many things, a lot of them not so complimentary. But unlike Islamist nutballs they're not suicidal.
I don’t think tomorrow there is an immediate risk. However, we keep pushing eastward and see some kind of ME conflict where we go in again and take away valuable (if not evil) trading partners, you will see a whole new ballgame. Putin may be brainwashed KGB but he is not a stupid individual. Our leadership is acting very bad right now and seems to be in confusion. The Russians are paranoid. That’s not a good mix.