A few Irish trawlers go fishing off Rockall
For some inexplicable reason, the Scottish mob got annoyed at this even though Irish trawlers have been fising there for many years.
Just to be on the safe side Ireland sent one of their fishery protection ships up there.
This pissed off the Scots even more so they asked to borrow a few war ships off England [suddenly the Scots decided there were advantages to being part of GB].
As a gesture of solidarity with a country which hadn’t royally been fucking around with EU membership, the EU dispatched a coalition of French and Spanish war groups to defend the Irish ship.
Trump was still full of goodwill towards the Irish so he nuked France, Spain and the UK. Unfortunately he still wasn’t sure what the Northern Ireland Border was and accidentally nuked Ireland as well. This at least had the advantage that it solved the Brexit fiasco as the UK no longer existed.
Not to be outdone, Russia nuked the US [with enormous casualties as the Americans who were fleeing south found themselves trapped by a huge wall that some fucker had put up].
Pakistan then wanted to join the party and nuked India, Israel nuked Iran, North Korea nuked South Korea and China nuked whatever was left.
And all over a little rock covered in bird shit.