Differences b/w EU-UA and US proposals. Not irreconcilable but some still some ways apart. I suspect it'll come down to several bilateral agreements:
US-RU: US agrees to lift sanctions and recognize Crimea
UA-RU: ceasefire along contact line
UA-EU: reassurance forces https://www.reuters.com/world/documents-show-differences-over-us-peace-drive-ukraine-2025-04-25/