Putin and Biden haven't spoken in years. I would say you're proposing ignoring the situation until it becomes even more of a powder keg in a decade or two.
Alternative is accepting some territorial losses, compromising, soldiers go home. Doomsday clock ticks back to 5 minutes to midnight.
You're acting as if this is the first time anyone has annexed territory. Do I like it? No. But you gotta manage with the cards you're dealt and that territory is not worth decades long conflict with two major nuclear powers.
