Implementation of Pacta Sunt Servanda in Contemporary Environment

Pacta sunt servanda is a key principle of international and national law. The paper discusses its international implementation to ensure consistent development and strengthening of international relations from the 12th century to the present day and how this principle is enshrined and implemented in international and national law. In addition, the paper discusses the integration of this principle in the Constitution of the Russian Federation and responsible relations of Russia with the Council of Europe and the European Court of Human Rights. The authors analyze the issues associated with the principle of pacta sunt servanda and provide examples of its violation, including the actions of the UK in Yemen, when the UK had committed not to use force and violated its commitments; the violation of the principles of non-use of force and diplomatic conflict resolution by the United States; its violation by the European Court of Human Rights, which does not comply with and distorts the principles of the European Convention on Human Rights and the Charter of the United Nations and exerts political pressure on the parties to the Convention. The authors discuss the position of the Constitutional Court of the Russian Federation on the implementation and non-violation of this principle in the Russian legal environment. At the international level, to implement the principle of pacta sunt servanda, it is required to enhance confidence between states and reduce international tensions.