At beginning of the war Russia had more equipment, and materiel on every row: much more tanks, and armored vehicles, overwhelmingly more planes, vast amount of

At beginning of the war Russia had more equipment, and materiel on every row: much more tanks, and armored vehicles, overwhelmingly more planes, vast amount of rockets vs close to zero in UA army. Also, "supported materially by NATO" is a misleading statement unless narrowed down to more specific areas. At that moment most analytics in the West expected Russia to win quickly, and few people were willing to vouch for sending substantial military aid after the debacle in Afghanistan. Javelins, NLAWs (from US, and UK, not NATO), but other stuff was mostly non-lethal, and frankly almost symbolic. It took quite some time before it became obvious that Ukrainian army fights effectively, and Ukraine is absolutely not in mood to surrender, when other NATO countries started to promise weapons. But even now many of these promises are yet to be fulfilled. Meanwhile after failing in wider campaign, Russia concentrated forces in smaller theater, and in Donbass they have now reportedly 10-15x advantage in artillery firepower. Note, btw that most of the territory Russians managed to capture is in the Ukraine's south which is grassy plains - arguably very hard to protect while enemy dominates in the air, no matter how much personnel you have.