It's Russia vs the Ukraine, but who is really fighting whom?
The equipment is American, British, German, and it's not being sold on the open market for a fair price to the Ukraine; Russia cannot also buy some.
As for the drones, they are mainly American. but where are they being controlled from? Kyiv? Or how about, more likely, via satellite links, Creech USAF base, Nevada, home of the Unmanned Aerial Vehicle Battlelab, and an Overseas Contingency Operations control centre.