Saudi Arabia carried out an extrajudicial killing in a small, neighboring state. This was carried out in the US. And for all intents and purposes could be considered an act of war against a state that has an unlimited war chest.
https://en.m.wikipedia.org/wiki/Turkey%E2%80%93United_States...
There isn't a fundamental ideological divide, everyone is just jockeying for a few more square-meters of this or that.
That "small, neighboring state" is a №2 state in NATO