'the part' and 'a part' are two different things, and it would also help to be clear on whether Crimea is considered part of conquered territory, or a separate concern from what's covered here.
Write clearer resolution criteria if you want people to trade your markets.

Would Trump saying something in a post-summit press conference like ‘we agreed it would be smart if Ukraine gave up some territory yeh that would be good’ resolve as yes? Or does it need to be a more concrete deal with clear statements from both sides?