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I don't think they will blame anyone, I think many of them will just be happy that it's over but that depends on how the war ends. If Ukraine lost a large amount of land yet was allowed to join the EU then I could see them spinning that as a win and I think many Ukrainians would be happy about it as their economic situation would improve, also the west might rebuild and invest in Ukraine which would further help them.
And if Russia takes the whole country then none of what the average Ukrainian thinks matters anyway as it will just be like East Germany.