Originally Posted by eerok
I think ultimately the answer to this question is "accurate long-range artillery informed by high-quality reconnaissance."
The more Russian formations Ukraine can destroy without putting more troops in harm's way, the better it is for them. NATO* can certainly supply world-class recon, on top of whatever else the Ukrainians have going on in that area. The west is also supplying more artillery pieces and ammo. Perhaps also aircraft. Airstrikes also being a kind of artillery, the next level would be for NATO* to start conducting airstrikes of its own.