“As Stalin observed: Quantity has a quality all its own.”
That is sadly correct. Ukraine is outnumbered 10 to 1. That means they have to win every battle. One loss and they go down.
So far they have been very good / very lucky, but that can’t continue forever.
They aren’t outnumbered 10:1. Effectively its only 3 or 4 to one, if Russia goes all hands on deck. But Russia cant do that, its got other “fronts” to watch, just in case. So its more like 2:1, assuming both sides mobilize proportionately to their population. There will be more of a difference in equipment, but maybe not if the Ukes get more military aid.