Peaceful settlement of disputes in international law is closely related to the prohibition of use of force and to the outlawry of war as a state policy. An important milestone in this regard represents the establishment of the League of Nations in 1919, and subsequent unceasing efforts in the interwar period leading to the adoption of general prohibition of the use of force in international relations as enshrined in the UN Charter.
These efforts are represented in a number of proposals, some more, some less successful, which were presented between 1920 and 1928 (i.e. the Treaty for Mutual Assistance 1923, the Geneva Protocol 1924 and the Locarno Treaties 1925), the most important of them all was the Briand-Kellogg Treaty of 1928.