I love it. It is such a stupid move that I can only laugh. USA will lose EU, very close ally with a huge economy. Where is the big part of military supply chain coming from? Well it is EU - i.e. big chunk of F35 is made in Europe. Which would be really smart thing to lose, when US Navy already has issues to build ships in general.
And then war with China comes around. Take Greenland and it is going to be more like USA against the world, than USA vs China.