Did you see Owen Jones suggesting Ukraine should be a 'buffer zone'? He was called out and forced into an apology for it, but the fact he said it in the first place is indicative of the mindset.
I didn't see that, no. But:
So Owen Jones is the person who you meant when you said the far left don't believe Ukraine has a right to self-determination and should be a vassal to Putin?
Cool. If that's his position he's wrong. Let's call him out on it. In fact, sounds like people did and he made his position clearer and apologised.