I believe this is ground zero to understanding the state of the world today.
For eighty years, the United States had the world by the tail. We may have gone hard in places we shouldn't have, but for the most part we used soft power and economic might to bring the rest of the first world, and most of the attendant satellites, into our orbit. They went along with our agenda willingly, for the most part, because they entrusted us to ensure and protect the peace and prosperity of their countries.
That's no good for Trump. He doesn't want the world by the tail, leading it by admiration and respect. He wants the world by the balls, leading it by fear and pain. He doesn't want other countries to regard themselves as willing partners, because willing partners want to have a say in how things operate. He wants other countries to be nothing more than toadies and supplicants, doing only what they're told while begging for our mercy and/or our discretionary largesse. Trump wants all others to feel the full weight of his power always and forever, because instilling fear and pain in others to make them do things they don't want to do is the yardstick by which he measures his self-worth. He gets his jollies by shaking down those who agree to be shaken down, ruthlessly punishing those who dare to delay being shaken down, and obliterating those who refuse to be shaken down at all.
Not even the best gangsters brutally debase their most loyal subjects for kicks, as a matter of course, in this manner. It's the worst gangsters who do so, repeatedly and gleefully. The best gangsters meet their end with a peaceful death enveloped in the bosom of their families. The worst gangsters meet their bloody end in alleys, barber chairs, and the back seats of limos.
This is what we're facing, and god help the world once this guy achieves his apparent goal of a North Korea-style hermit terrorstate supported by an amoral military, militias, secret police, and civilian snitches.