Yeah FPV drones have massively increased the cost of invading a country. It's basically a return to WWI style trench warfare, except no man's land is the size of the range of the drones (20+ KM).

the gray zone is ~200km so long as you have ISR drones able to see it

artillery, missiles, and long range drones are in the mix too. AI enabled spotting makes ISR detection rapid and effective.

some kubernetes container spots a random pixel that means hidden vehicles and a HIMARS strike is dispatched ASAP