Unfortunately, whether you call it Realpolitik or political realism, the self-interest of nations makes them interfere with efforts to advance another nation because they fear the dominance of a particular nation. This irrational fear of nations for one another creates the threat of war and aggression as a backdrop and thus leaves the poor and oppressed to their own survival in turbulent nations. Food and water and medical shortages compound the problem.
The proliferation of weapons is a derivative of this irrational and counterproductive distrust of one another. It leaves the possibility of a grave mistake that can lead to global warfare which is a grim outcome. In effect, because of mutual distrust and overzealous nationalistic leaders, we must walk on eggshells perpetually.