Four years of war in Ukraine - when will it end?

On the Ukrainian side, the Ukrainians have been studying the problem of how to conduct attacks in this very transparent, lethal battle space. Some of their units, the units that have not been committed on the front line as intensively, have had the time and space to train and practise and have now validated certain tactics that have allowed the Ukrainians to counter-attack very successfully in Kupyansk and also in the south. But these are very, very small tactical actions and the question for the Ukrainians at this point is can they somehow replicate those tactical successes on a broader front."