Any peace deal that doesn’t involve Russia leaving behind all Ukrainian territory rewards Putin’s Russia for their invasion

Any peace deal that doesn’t involve Ukraine leaving behind all separatist regions rewards USA for overthrowing the government of Ukraine.

I can’t think of an explanation as to why a US-led deal with the same terms would be inherently better

On paper if it had the same terms then it wouldn’t be any better. The problem is that the USA doesn’t want peace, they want to do as much damage to Russia as possible and they don’t care how many Ukrainians have to suffer and die as a result. The USA can then extort Ukraine using the war loans as justification.

The best case scenario for USA is that Ukraine wins, but both Ukrainian and Russian economic and military strength are severely depleted in the process. This reduces Russia’s power to oppose USA on the global stage (like defending Syria and Iran), and turns Ukraine into a vassal state or neo-colony of the USA; massively increasing USA’s hegemony.

Best case for Ukraine and Russia is an immediate end to the war. But Zelensky is an american puppet and won’t (or can’t) negotiate peace.