Armenia is in a tricky political situation there. Bear in mind Iran is a fairly close ally, if it gains US support then clearly it loses Iran. Also Israel backs Azerbaijan so possible the US tells Israel to cool it in that department. The 2020 war also started roughly the same time Armenia started trying to get closer to Nato, so it’s possible Russia almost let Azerbaijan attack in order to force Armenia back into line.
I’d always thought if things did escalate there into a larger regional war that the US would back Azerbaijan. Iran’s northwestern regions are primarily populated by ethnic Azeris. You’d reasonably suspects that Azerbaijan would want to claim those lands and those people would want to join Azerbaijan so probably wouldn’t be a hard sell.
But then, things are never straight forward in geopolitics. Also the hypothetical regional war I mentioned is probably not that far short of a world war so hopefully unlikely in any case.
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