Nuclear attacks are increasingly likely, just by virtue of the eventuality of it was it exists and can be used. Beyond that tactical MIRV's are incredibly efficient weapons and aren't as radioactive as the old dirty ones from the beginning of the cold war.
Russia filled St Petersburg with their new platforms and systems because not only does it make it impenetrable (Russia literally burnt Moscow to the ground when Napoleon came knocking, their entire march was pointless) it also means they can quickly strike all military installations in the Eastern bloc, destroying the NATO contingent entirely. Of course Russia would also be practically destroyed and it'd be over within a day regardless.
If War is upon is, then i'm afraid it's probably the end.