It's basically an opening US position, and if there's a serious plan to wind the war down on the US side then there are going to be months of discussion going forward. If the US expects Russia to simply accept the proposal as is, that's not gonna happen. Russians already stated that what was discussed in Alaska would have to be the bare minimum starting position. However, the plan might be to just dump the whole thing on the Europeans. If Europe and Ukraine reject the plan, then Russia doesn't even have to say anything. The US will just say this was a plan acceptable to us, and since you don't like it then it's all yours, have fun with it.