NATO vs Russia wouldn't be decided by drones.
NATO vs Russia would be decided by geography and economics. Russia is fighting Ukraine along the eastern border of Ukraine from, roughly, Belarus to the Sea of Azov.
If Russia picks a fight with NATO, the front line on land alone would extend from, roughly, Murmansk to Baku. Russia would have to cover all of that. I doubt it has massive reserves in hand for that, so it would have to dilute whatever it has brought to bear against Ukraine to cover that exciting new distance. Ukraine would not of course be diluting itself to cover that; NATO would bring fresh forces to cover all of that.
We could suppose Russia would not do that until it has settled with Ukraine. We could also suppose that shortly after Russia is at war with NATO, Ukraine would resume hostilities to recover lost territories and invite NATO to use its territory for operations.
And of course it would be open season on all of Russia's major military assets, everywhere.