If Trump pulls the US out of NATO, then he'll go for Greenland within 12 months (after he's taken Cuba) and Russia will make an attempt on one of the Baltic states or Poland in the same time frame to test the fibre of the EU's fabric. It will probably opened up an opportunity for Putin to use the big weaponry in Ukraine and concentrate his firepower westwards.
In the intervening chaos, China will probably make a move for Taiwan.
80 years of (relative) global peace is unravelling at a dramatic rate because of the USA & Israel actions. There's been talk of a 'pre WW3' phase of engagement for a while which I dismissed as hyperbole, i'm so sure now. The fucking wolves are now on the verge of getting in with the sheep.