The new japanese constitution after world war ii contained a clause that

Article 9 of the Constitution of Japan is a clause in the Japanese Constitution that prohibits acts of war on the part of the state. The Constitution was adopted on May 3, 1947, immediately after the Second World War. In its text, the state formally renounces war as the sovereign right and prohibits the resolution of international disputes through the use of force. The article also points out that to meet these objectives, Armed Forces with war potential will not be maintained, ALTHOUGH Japanese Armed Forces maintain facto, known or as the Self Defense Forces of Japan (自衛隊 Jieitai?) (JSDF for is an acronym)