>>213966927
Other than obvious reasons such as advance slog due to good tech capabilities, unwilingness to take risks on Russian side and play dangerous with their equipment, constant mine field problems, constant drone problems, snipers and artillery, as well as UA war being a sort of controlled test ground for drones, the primary reasons are hard to assess.
Russians very much do have, or at least used to have both good mil strat planners and vets for rookie training, academies are high quality, yet the way war proceeds is fucky, initial assault is at odds with military expertise at least to my dillettante view.
Some say the war is an utter lie, the primary reason is political, and USA, UA, RF and partially EU have an agreement, either mid war or since the start.
Not impossible, historically Russia lost 1st Chechen War this way IIRC, the political leadership just sold out and ruined everything at the last moment. Some others said Putin is being lied to at some level in command chain.
Beyond that I can't say, I never looked deeply into it.
It's a grind, and it seems possible that the actual purpose of the war is either planetary despair increase, controlled chaos in details in the long-term, or outright sacrifices.
But it is fucky. Something critical is amiss, this war is irrational. Something inhuman.