In the ostensible U.S. and Ukrainian democracies there simply isn't the public support for the ends you suggest.
Of course they do! They want their sacrifice to not have been in vain.
I can only imagine how upsetting it would be to lose a limb because Boris Johnson said to 'fight on', only to get a worse deal in the end.
I think Obama understood this situation better than the neocons, who forgot their policy has to in the end appeal to the American people, or it's doomed.
Speaking with the Atlantic’s Jeffrey Goldberg after Russia’s annexation of Crimea and aggression in the Donbas, Obama emphasized the limits of his commitment to Ukraine. As Goldberg wrote: “Obama’s theory here is simple: Ukraine is a core Russian interest but not an American one, so Russia will always be able to maintain escalatory dominance there.” Goldberg then cited Obama as saying, “The fact is that Ukraine, which is a non-NATO country, is going to be vulnerable to military domination by Russia no matter what we do.” In other words, a U.S. president all but acknowledged Ukraine as a Russian client state, telegraphing to the leader of an aggressive, revisionist power that the United States would stand down if Russia were to widen its war. Moreover, the doctrine of Russian escalation dominance—that the Kremlin would always be willing to exercise superior power to get its way in Ukraine, whereas the United States would not—became the governing principle of U.S. policy. This principle echoes to this day, holding back U.S. support for Ukraine.