Your proposal seems fair to me.

That’s not quite accurate. The U.S. is the country that has provided the largest support to Ukraine. Congress has voted $175 billion for Ukraine. About half of that was sent to them and the other half was spent domestically to help them.

Ditching the sanctions is likely considering they harmed the hegemony of the USD.

It’s going to be hard finding an opponent playing a positive-sum-game

Ukraine is already struggling immensely with the US support. Imagine what will happen without US support.