Associate
I don't get the point personally.
Putin is never going to negotiate a peace that can be trusted. Hes never going to negotiate a peace thats going to be acceptable.
They need to kicked out, then allow Ukraine into the EU and NATO sharpish.
IMO let them join both without the lengthy processes, as say "emergency members" and with some specifications on meeting all the normal criteria laid down with timelines.
Joining NATO would probably be easier but still not as simple a walk in the park as it could be.
Whilst their boots on the ground will be in some cases able to integrate with NATO that wouldn't apply fully.
out of interest, what benefit do you see Ukraine providing to the EU? Ukraine is in a destroyed state and need £billions to put back to its original state before the war....... and you can guess who would be funding that if they join. (which will never happen in the next 100 years). Nato on the other hand is more of a possibility, depends how much guts NATO have.