The reason why the West isn't doing anything is probably because it can't do anything. While it feels good to say that we should just invade and save the day it ignores important geopolitical realities, namely, we don't have any allies in the region that would cooperate, and we would make a lot of rivals that would make life difficult in the best possible case scenario, and cause us to get into a conflict that would possible last decades. In the worst case scenario it could spiral, a war in a strategic region between 2 nuclear rivals, executed by an alliance of other nuclear rivals cannot be taken lightly. The first world war was started over a lot less.
I don't believe the UN should be doing nothing, but the reality is that they can't do much, and unilateral action by other actors would be extremely dangerous, perhaps even catastrophic.
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