Trump, with his renamed "Department of War", is INSANE.
He has insane Baby Boomer delusions of grandeur. 24/7.
He wants to recapture the glory days of the American Empire. That includes reviving the Cold War, leading Americans during an actual war, etc.
See, when you get old, you start to look backwards (towards the past) more and more. Which makes sense, as more and more of your life is "behind you". Nostalgia becomes very attractive, extremely powerful at times. Trump is doing this IN SPADES.
He is DESPERATE for a legacy. He wants to acquire Greenland, etc.