Others tried to invade Russia and failed. The way to beat them is through bankrupcy. The US managed to do that to the USSR once. The Ukrainian strategy of taking out their refineries is good. Regarding interceptor drones, Russia can't complain that the West is giving them offensive weapons. Although I fail to see how anything short of lasers or microwave weapons to fry the drones' circuitry would work against large drone swarms.

It works by large swarms of interceptors. 1000 shaheds met by 2000 interceptors.

Which is why you want "cost less than 10% of the Russian systems destroyed."