My prediction: This board will die before it can exist. EU will give the middle finger to Trump and befriend the whole world, he'll trow a tantrum and send soldiers in Greenland. Those accepting to go will get their ass whooped by better equipped and trained for arctic warfare EU soldiers (they can do a metric shit ton of damage in the arctic, probably not in another environment against the US. But choosing the arctic as a first battleground is a huge tactical mistake against Norway/Finland/Sweden/Denmark/France/UK/Netherlands as they have specialized troops and materials for those environment, the US as way less of them).

This will end NATO as we know it and be the start of WW3. But this WW3 will last only a few weeks as most US soldiers won't fight against allies and will therefore rebel, do a coup or something while the US population will finally say stop that shit. It might end up in a civil war there, Trump and puppets will probably get shot by soldiers from California, but the rest of the world will be at peace and do business as usual while the American empire disappear in flame.

Russia won't change, they can't do shit anyway. Europe will have troops in Ukraine until it's a stalemate peace giving 100% of Ukraine territory back, but Russia won't change. China will be a friendly business partner, they might get cocky with Taiwan but they won't attack any other country.