They have a airforce that is able to level buildings that ground troops have to move in.
Their MIC outproduces all of Nato combined.
They have shit ton of SAM systems, so much that they are using them as ground attack, just to deplete Ukraine air defenses or to give away their position.
They produce more drones and have direct access to China for drone parts, China produces 90% of the parts for drones worldwide.
Russia still produces more tanks than what Ukraine has. Newer build tanks come with factory installed cage armor and other bolt on armor and active defenses. Ukraine commander says those new tanks need around 30 to 40 FPV Drones to disable them. Which is still cheaper than a cost of tank but Ukraine is running out of drone operators that they now have female operators, a video of air strike on female drone operators launching and retrieving a drone on front line was shown.
Russia has a higher kill ratio. Budnov himself said Ukraine needs 30k people a month to be conscripted to maintain the current level.
Russia can at any point cripple Ukraine further since they have the advantage in escalation matrix.