Ukraine has captured more heavy equipment intact from Russia then they have lost
In fact, they are even using TOS-1A thermobaric systems against Russian positions. They are very rare, only around 50 in the world, and Ukraine is using them because several fell in their hands. And they even have tons of missiles for it courtesy of Putin.
https://twitter.com/user/status/1511337378035679244
Obviously Ukraine needs a lot more heavy equipment especially if it intends to go on a Donbas offensive, but Russia is losing insane amounts of equipment, many of which cannot be replaced. The level of aircraft attrition rate can only last another month or two at best.