What is the endgame here? It's not like we started the war? If anything we, the Europeans naively made ourselves Russia-dependent on energy assuming that having a win-win deal with Russia will eliminate any conflicts.
>Now all of a sudden people believe ukraine can destroy russia?
I don't think that anyone claims that this is the goal of Ukraine or the west. This war ends immediately as soon as Russian troops leave Ukraine. Why should it end with Russian troops taking all Ukraine?