If there is war between two countries for one region than the solution is unifying both the countries together and have the shared values. Yes, it seems impossible but it needs a moral spiritual forces along with the other unifying powers of the universe. But, one thing is sure it is historical. Both have to share their strength or either one has to be responsible enough to hold the other ones hand firmly. Its like a marriage tie between two families. Both must accept each other via an inner link of will.