Re: Presumbly the UK has similar plans
President Zelensky has already been negotiating. Though nothing has come of them since the Bucha massacres came to light. He has also said that he will agree a ceasefire and negotiate if Russian troops return to their pre-war February positions. Given Russia have repeatedly proved they don’t respect heir own ceasefire agreements, and have been engaging in massacres and mass deportations of Ukrainian civilians in occupied areas, that’s a pretty moderate position to have taken.
They’ve also said they won’t officially accept the occupation of Crimea as a permanent situation. Which I suspect they’ll have to, to make a permaent peace deal, rather than just a ceasefire and long term frozen conflict, like the Korean War. Which has never officially ended. But then Putin might re-invade at any moment anyway. No permanent treaty is worth anything with him in power.
If we take the position that we won’t remove sanctions without Ukraine’s say so, then we give them leverage in any talks. And we’ve got $300 billion of frozen Russian government money. So if they want to keep Crimea on a legal basis, they can buy it. That support also gives us leverage over Ukraine's negotiating position, though we should be careful using it.