This is not unlike saying that rape ceases to be rape when the victim stops resisting.

We have every reason to think that "ending the war" under Chief Cheeto will mean "capitulate to the aggressor," and Russia has already shown its eagerness to commit genocide against Ukraine and eradicate it culturally.

So he is indeed complicit. The unacceptable terms he wants or likely will suggest (and the unacceptable manner in which he pursues those terms, by negotiating without Ukraine's involvement) -- essentially Ukraine's surrender -- amount, by corollary, to a justification of further Russian aggression when Ukraine rejects them.