And OP, I haven't been following the situation too closely as of late but I was kind of wondering the same thing as well. I would have thought that if the Russian resolve to conquer Ukraine was great enough, they would have employed blitzkreig tactics instead of whatever it is they're doing. They've got nuclear capability, FFS, so I don't think I'd be faulted for assuming that any country would rather surrender and not fight than risk something truly terrifying and devastating happening.
I'd be very interested to hear others' opinions on this, too.