Why are we in Ukraine:

Vladimir Putin and the Russia he rules cannot stop fighting. As long as the United States is involved in arming Russia’s enemies and bankrupting its citizens, they are quite right to believe themselves in a war for their country’s survival. The United States, thus far in a less bloody way, is also involved in a war it chose but cannot exit—in this case, for fear of undermining the international system from which it has drawn its power and prosperity for the past three quarters of a century.