I don’t really think I am, but fair enough.
Ukraine might have more advanced infrastructure than Afghanistan, but having that infrastructure within reach of Russian missiles and airstrikes means that they’d have to defend it or else lose the means to sustain a continued resistance. Again, I don’t think people appreciate just how much trouble Ukraine would be in if the west pulled support before a ceasefire deal is struck - Ukrainian forces aren’t guerilla fighters. If Russia didn’t already have the upper hand now, they certainly would once Ukraine was left to maintain their resistance alone - and then it would really only be a question of how long Russian citizens will put up with their wartime economy (and how many soldiers NK is willing to lose).
I’m not suggesting they would or would want to take all of Ukraine, just that Ukraine isn’t likely to gain any ground or stop further Russian advance without outside aid.