[way]

US and Nato should supply plenty of drones if they don't want to join the fight directly. Maybe even covertly supply the pilots that are based remotely outside Ukraine. The Russian convoy will be toast since the vehicles are packed so tightly together.

Russian soldiers have no motivation to fight, no food or fuel, not even told beforehand that they were coming into Ukraine . So they just avoid direct fight, instead rely just on shooting missiles and artillery from a safe distance.