Not crypto, not gold. All of these have an implied or perceived value. This will last until people realize that the value is an agreement between them and others. Depending on how things are going there will only be some things that retain real value beyond prestige. Commodities. Raw resources will retain value forever or until spoilage. However refined there will be a value chain. Veblen goods are not practical, and as a result, will not hold up as a currency in any scenario where survival is the main priority.

Yup 100%

Umm… fire?

Me either.

That may be true, but while parts and pieces of downed aircraft may land over a mile or two from an incident based on altitude (they are no longer flying, they are falling), most airspace incursions are not happening just over the border but further inside the defending territory. It takes time for responding fighter jets to scramble and confront the invasive aircraft. This is occurring while traveling at high speed. So the likely answer is that they are not a mile inside of the airspace, but tens of miles at least. It should be no trouble to discern over where the incursion took place.