Your obsession is too big, it takes a long time to wait for a crisis in the country you live in to buy or build what you want. Rather than waiting, why don't you invest immediately?
Maybe not immediately but subsequently. Indeed, hoping for a war is a bad thing itself, instead use the current prices to buy property if you are going to live in it. One can only buy large number of properties when they are having money in surplus and such people are not going to visit this forum.
So instead of those post-war thoughts, buy them now and sell them after a few years once buyers start coming in. That is hoping your evaluation of the land is good and you manage to get buyers.