While we may be heavily invested, in terms of treasure, training time, and materiel, in the current war between Russia and Ukraine, someone needs remind Mr. Schumer that this is Ukraine's (and Russia's) war.
It is not our war, at least not directly, and thus 'we' would not lose or win in Ukraine. They will win or lose their war.
If we are not fighting there, did not initiate hostilities (other than most indirectly by having an incompetent administration) we cannot own it without taking over from the country that was invaded.