A future war with Russia would be absolutely devastating for us Brits, we no longer have the military resources to project power without assistance as it stands and that's against Guerrilla type advisories in the middle east...
We have a bare bones army, stretched so thin that any more cuts would break it, a navy with no operational aircraft carriers and aging destroyers etc and an air force with a barely functioning Eurofighter and some seriously obsolete Typhoons... do we even have bombing capability now?
Russia, despite our opinions of it, have a massive military and a naturally tough mentality.... and given the state of France, Germany, Spain, Italy and the UK would probably crush us through sheer weight of numbers.
So War looks inevitable, conscription hits but we still lack in the infrastructure to build, tanks, Planes, Helicopters and ships... we rely on America for support who will stay out of the fight as long as they can.... Sound familiar?
Personally if I was Russia I'd surprise spank the U.S out of the fight early with a massive assault on their soil..... Preferably none nuclear, the rest of nato etc wouldn't then be in a position to intervene, and would then be playing the waiting game to see who wins.