As a complete layman, I highly recommend the YouTube channel of William Spaniel, along with his second channel Lines on Maps Extra. He explains current political events from his academic perspective. Regarding what happened now, the TL/DR conclusion is that Trump wants Europe to focus on its own defense, while US will brace for potential conflict with China. If you think that NATO might get caught up in a two-front war, this makes a lot of sense. The fact that Trump uses unorthodox methods to achieve this isn't exactly interesting on its own, which is why the heated discussion shouldn't really deserve as much attention as it does.