Scientific inventions, growth of industries coupled with spirit of nationalism has virtually demolished the frontiers between nations and now there is a greater coming together of nations. The "more abundant" penetration of trade and communication and anxieties of each nation into the domain of others and the consequent increase in the impact of any action of government upon the interests of others has made it increasingly necessary that there should be a proper establishment of relationships between national interest and international obligations. It is being realized that it is the peaceful co-existence or the observance of the maximum of "Live and Let Live" which is necessary for the purpose of international peace and understanding.

Because of this realization that compromises, co-operation and, as far as possible, peaceful settlement of disputes receive greater consideration in international affairs. In a sense, international relations are now increasingly based on these principles of peaceful co-existence rather than a military