Ukraine, two years of war: how can we still believe it?

Launched at the end of spring, the Ukrainian counter-offensive had high hopes. Nine months later, the results are mixed. The front line, frozen after almost two years of Russian invasion, has not seen any significant breakthrough. The Ukrainian army has even just lost its commander-in-chief, Valeri Zalouzhny, replaced due to lack of success. Should we still believe it? However, the reasons for hope are there. But which ones?