I'll ignore the fact that you responded to my question with other questions instead, and actually answer yours. It's a proxy war. We're pretending we're not actually at war with Russia and this is all the heroic effort of Ukrainians. So the same reason we don't impose a no-fly zone over parts of Ukraine - we're trying to balance escalation that achieves a goal without escalating too far that there is no return.

Now your turn. Who other than the US benefits from this?