Obama’s foreign policy credo was, famously, “Don’t do stupid stuff.” He delivered, too; whatever mistakes he made were the result of inaction, not adventurism.
As you would expect, the Trump Administration has quite a different ethic. Based on what we’ve seen thus far, I would describe it as “Doing stupid stuff is perfectly OK as long as it makes you look like a decisive, unpredictable, strong leader.” That’s likely to get us in a lot of trouble down the road, but America voted for it, so the entire world will have to live with the consequences.