I don't think Ukraine needs to win on the battlefield. A controlled retreat while inflicting heavy losses on the advancing enemy is sufficient to me. The longer the war goes on, the more the civil sector of the Russian economy should deteriorate along with Russian state finances until it eventually becomes financially impractical for Russia to continue with the war.
This is the problem with pro-Ukrainian statements
A "controlled" retreat you say...... Does this controlled retreat include losing startegic cities like Pokrovsk, Myrnhorad, and Hulyapole while cities like lyman, konstantynovka and Kupyansk are in the grey zone?
That term is only applicable when the country in question possess the capability to continue the war for at least 5+ years without losing anything significant
Now, Russia has re-entered the Dnipro Oblast and they are progressing rapidly. Even if a ceasefire were to be signed today with the preservation of the current frontline, just as Zelensky demands, the demilitarised zone of around 10 km will literally prevent Ukraine from even touching the national wealth of nearly 50% of the country (Dnipro, Zaporizhia, Kherson, Kharkiv, Luhansk, and Sumy)
As for Russia, and as much as I hate to admit it, they still have tons of money to spend; even with the crippling sanctions imposed by the US. By this point, this war is just not sustainable for Ukraine at all. Sooner or later, the whole Ukrainian frontline will break and Russia will have lots of "fun" then
They have lots of money that they are posting about "disposables" and people think that the Russian economy will break before the Ukrainian one. Utterly ridiculous