Kosturi returned into Albanian political life on 1 October 1943, as a representative of Korçë region, and the same year was elected to lead the Commission for Mandate Verification, later Chairman of Constitutional Assembly of Albania on 25 October 1943. As a chairman, he declared as "void" all laws and legal act approved during 7 April 1939 and September 1943. Thus the "Personal unification" between Albania and Italy (established on 12 April 1939) came to an end. He declared the official Albanian neutrality in World War II.