The Russians will more likely watch us implode, seeing how we are plummeting at an increasing speed. They don't need to risk their cities.
They are however, very concerned about the crapastan countries to the south. Particularly around Sochi.
The nuke drills are not posturing for propaganda.
The Russians and Chinese are NOT afraid to go nuclear on the Islamic hoard. It is also partially the reason Iran is building nuclear weapons itself (and why it is not so much of a concern anymore at this point).