Nikola Tesla believed that war cannot be eliminated by outlawing or disarming, but by empowering every nation, weak or strong, to defend itself. According to Tesla, if every country can defend itself successfully, there would be no purpose for war. In light of Einstein's theory of mass and energy interchangeability, it is possible that nations could develop non-kinetic defense systems to enhance physical security and national defense. By combining cyber and electronic defense systems into an electro-cyber form of defense technology, societies could potentially utilize this "soft" form of warfare to resolve disputes, establish dominance hierarchies, defend property, rebalance power structures, and prevent nuclear escalation.