"in return for a full withdrawal of Russian forces from the Donbas region and an end to Russian support for the independence of the two Moscow-backed separatist

"in return for a full withdrawal of Russian forces from the Donbas region and an end to Russian support for the independence of the two Moscow-backed separatist regions in eastern Ukraine, a demobilisation along the Russia-Ukraine border and an assurance of Ukrainian sovereignty" And what's the guarantee Putin wouldn't attack Ukraine anyway after few years? Russia did assure Ukrainian sovereignty in the past and apparently it wasn't worth the paper it was written on. Anyway, that's not compromise Russia would have accepted, back in December they demanded essentialy reverting NATO to its 1997 state.