Trump erratic behavior, impulsive decisions/reactions, befriends with dictators and somehow admiring them, his relationship with Putin and his love for attention, his big ego making him a dangerous person. Last meeting at Nato questions were risen about the potential of Xi and Putin working together to create diversion and at the same time preparing simultaneously military actions, they know very well Trump's personality disorder, Putin has been plying him for quite some time and all of it being under China's control/advise, it's obvious that Trump would (is) not a credible international leader in such matters, Nato knows that Trump is a TACO and they better prepare themselves to be ready without the USA
World War Three fears as NATO chief warns of joint Xi and Putin attack
https://au.news.yahoo.com/world-war-three-fears-nato-122927606.html