You do not cede territory under the threat of armed force You do not pressure states to cede territory under the threat of armed force You simply do not do it; if the US were to force Ukraine to do it, there goes the bedrock of the post-war order

Some informal arrangement where you freeze the lines and Russia administers territory not recognized can be done. But you do not cede territory. This sounds like it's nothing but I swear to you this would be big.