I don't think anyone has answered so I'll have a go.
Though before I do, I think its important to say the hypothetical "yeah but what would you do" question is not a valid one.
This war is a crisis that is many decades in the making. It didnt start in 2022, or 2014, barely even 1989. Like so many of the horrors of the world, they are born of deep roots and long standing institutions. So to ask "what would you do" is ludicrous. Who am I? What power do I have? How many decisions am I in a position to make? Over what time period? Am I in charge of the British Army? President of the USA? NATO Japan office secretary?
Hypothetically temporarily jumping in the driving seat of the class domination juggernaut is not our role <none of these people are anything to do with us. All we can do is try and understand what it is they are doing and why they are doing it, and ideally use that understanding to stop them once and for all. Even to suggest "well lets see you do better" is to give unintentional validity to our leaders, that they're doing the best of a hard situation. No, fuck that, they are the situation.
There's a good reason why MI6 boss Richard Dearlove said Corbyn couldn't be allowed to become PM, or why a British general said the British army could stage a mutiny under Corbyn, or why troops started doing target practice at Corbyns picture. That's a real world example of a hypothetical 'what would you do' in danger of becoming a reality, and it is utterly inconceivable to the establishment......an establishment that creates this and all wars.
I think its a trap to play the What Would You Do game. All we can do is understand What They Do. Does that make sense? I hope so. But that seem like a get out right?
So with that above proviso out the way, and to play along with the hypothetical question, what would you do, first thing is none us here have all the facts available to make any judgement. All we can do is glean truths from amongst the propaganda. For months now it has looked to me like Russia has successfully won the coast from Ukraine, and will cleave off the south. What are the chances of winning that back? We're not privy to all the many variables you would need to know to make that kind of calculation. But from where I'm sat it looks done to me, short of a major escalation, the implications of which are hard to conceive of.
Teuchter's post today sums up how it looks to me, based on my limited access to the full picture. That's how its looked for months now I think despite the best efforts of the media to suggest otherwise. The latest debacle with cluster bombs also suggests munitions are running out in general, adding to the picture of exhaustion. If stalemate is where its at, then there are many ways to go through the mechanics of negotiating that territory, creating a new heavily militarised border. East/West Germany is an example, but I expect there are better ones. Its going to be a new cold war situation.
A state losing territory through war and a border changing is still quite common in world events. One thing I would expect is that from a long view of history if that new Ukrainian border becomes a reality its not a border that's going to last that long (relatively speaking at least). I'd like to think the Russian empire will fragment eventually.