No body gives you power but it is taken from the people by those that need it. It is taken from the poor, the rich, middle class, religion, ethnic groups,weaker countries etc.If you need power especially politicians and world power countries,these people can go to any length to make sure they get that power. Check out what is happening in Russia and Ukraine ,Isreal and the Palestine. Each country is showing power either by technology or man power.
In counties that have democracy, the power is in the people. And that's what these politicians makes them power hunger. In a simple publicity stunt, they are praised and loved and they know the formula to be loved by the most and to get into that position that they crave for the power that it has got. As for the superpowers, in terms of military, we know why these countries are fighting and that's to show how powerful they are and they can take territories based on their own belief what is theirs. They dont need and choose bilateral talks because that's too peaceful for their people. *pun intended.