I don't know how you can say that wars are getting cheaper? What is this, is it literal or what? Because literally speaking when we say wars that means before this happens they
need powered weapons, and they are not cheap.
Other countries just to have high powered weapons even though they do it illegally and this is where their illegal transaction payments come in, they often use bitcoin
or other cryptocurrencies to send their transaction payments for this matter.
The use of cheap drones by Ukraine to attack Russian war jet fleets might be the reason why OP assumes that war is cheap. But it's great that many responses have made it clear that war is the most expensive project a country can undertake. The amount of money that has been spent in Ukraine and Russia could be enough to turn a third world nation to a developed one. It is estimated that Russia has spent about $200 billion on direct military spending. While the cost of human lives cannot be estimated since about 700,000 have been killed or wounded. Maybe Ukraine has spent more and faced more human casualties. We shouldn't forget that the cost of reconstruction is also part of the price of war.