In terms of numbers according to the Wikipedia article they have about 650 air planes and ~300 helicopter's.
Thats a solid fighting force for a relatively small country.
Russia as lots of tools - missiles and such that are good at destroying buildings.
The problems in that Putin understands that the cities in Ukraine have value. He is trying to take them over with minimal destruction to the buildings at least right now. That way he could move his people with with out needed to rebuild.