Russia's oil refining capacity. One refinery was 5% all by itself.
When the Russian separatists attacked Russia/Belgarod borders, it caused Russia to use helicopters/fighters to take to the air. Ukraine used this moment to send their drones to hit Russian interior targets to confuse Russian air defense because they had so many friendly/foes in the air. It is thought that one of Russia's few IL-76 command planes was shot down due to friendly fire during the confusion.
They were hitting refineries that were 600 km in the interior of Russia.
US's new artillery factories will come online at the start of 2025. Hopefully, the artillery the Czechs have collected and the EU will soon purchase will be enough of a stopgap.
Regardless of the factories coming online, Russia will continue to have an artillery advantage.
We are seeing an impact of the sheer number of disabled adults in Russia. The number has tripled since pre-war numbers.