This is highly dependent on the conflict and the ally in question. I've seen a lot of people reference Ukraine. Ukraine is not a NATO country and we've already gone way beyond what we are required to do for them. The US should cut off the aid to Ukraine completely and not get involved further in that conflict. If however Russia attacked an actual NATO country, then the US should get involved. I've seen several conditionals on this point, mainly concerning whether NATO countries are upholding their end of the NATO agreement to spend at least 2% of their GDP on military. While I do think we should put more pressure on NATO countries to meet that obligation that they have agreed to, I think it would set a very bad precedent if we were to not help them if they were attacked by Russia.
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