UAF cannot fight Western type combined arms campaigns for three reasons:
- We trained tactical leaders and soldiers (including vehicle crews etc.) in crash courses. That's all you can train in the available time. What we could not train were officers and especially staff officers. Some battalions in the UAF are commanded by literal privates or corporals. People who have distinguished themselves in battle, but never gotten any formal training. Those people do not have the ability to think combined arms. There is a reason, we send staff officers to college, military academies, army colleges and institutions of higher learning and then polish them for 10+ years before they become majors or even battle captains. UAF personnel never had that time and they also suffered massive casualties among their best in the early months of the war.
- We never sent them modern fighter bombers to achieve at least local air superiority and wear down enemy integrated defense networks as well as entrenched positions.
- All we did and give, which was plenty and really a lot - though not always in time, maybe - still came not quick enough to prevent Russian Armed Forces to entrench deeply and in multiple, often formidable, layers.
Especially the last item, the deep and multi-echelon defense networks are something that modern or even peak of their time (think: Desert Storm) Western militaries would struggle with, especially on such a long front. It's just an insane amount of mines and trenches to cover. I think, Desert Storm showed what was possible, but we have neither the troops nor the spare issues of AFVs, MICLICs, personnel and frankly: corps, to do it ourselves.
This war must be fought and Ukraine must win, but it's not something that will come this year. At least not on the battlefield alone.