I would say that England would win, the English are not just for a walk in this Euro2020 and they just want to win the cup.
I have not seen Ukraine's game, but it may be even with England, although I doubt it very much, the English will not let themselves win so easily, they just beat Germany and I do not think they want to lose against Ukraine. l
The match would be decided at the end of the 90 minutes. It's quite difficult to predict football these days. Some big teams have fallen to smaller teams in this competition.
I go for England win too anyways.
You are right with that, we can not predict what will happen in soccer, for all the results of the "good" games that we had said of great teams, at least the England-Germany or even the same France-Switzerland, it is incredible what is happening in soccer and in this Euro2020.