Peace will come when The Ukraine recognises that, as Ban Ky Moon has stated, The Ukraine is still part of the Russian Federation. That, then puts the political border on Poland's eastern border and those of Slovakia, Hungary and Romania.
What the implications of that are, is to be discerned: a proposal would be a demilitarised zone from Finland southwards, to Turkey and The Balkans, as a Federation of sovereign Co-operative Socialist Commonwealths.
https://www.independent.co.uk/news/world/europe/zelensky-ukraine-conflict-nato-russia-b2036280.html