It feels to me that something pretty nasty is brewing and that it'll likely involve Trump screwing up, be it in Syria, North Korea or somewhere else. Whether it will draw Russia in, or if Putin is smarter than that, remains to be seen.
Civil war in the UK is unlikely. Civil unrest on the other hand seems pretty likely given how much anger seems to be building up.
War with Europe? Not going to happen. Even the hardest possible Brexit won't cause that because what are we going to be fighting over exactly? The UK is self-harming, not being harmed.
All eyes on Trump.