The article reviews the main forms of the modern activities carried out by some Political Powers in the world diplomacy. Although there is agreement in modern legal doctrine that the Executive Power of the countries is responsible for administering the foreign policy objectives of the State, in recent years the independence of the Legislative and Judiciary power of some countries has grown in such a way that now they actively participate in the world political scene, even with a political message different from the official foreign policy of their own country. In these cases, for example, the Legislative and Judiciary powers make their own diplomatic structures in parallel form to the Executive Power and send representatives to other countries to try to influence foreign policy; negotiate contracts with other foreign political authorities; or participate in international political forums where they sign treaties with repercussions in Public International Law. In addition, such behaviors have made possible that the Executive Power of a country has had to face their Political Powers to control the foreign policy of the State, to avoid sending an unambiguous message that damages the political image of government. This article also examines some national conflicts and crises that have been caused by these political tendencies, which are known as: Parliamentary Diplomacy, Judicial Diplomacy and Electoral Diplomacy. These political tendencies have gained great interest in the academic communities linked to international relations not only because they are novel strategies that can help peace, but also they are unpredictable and potentially can damage the friendship between States.