Enckell returned to politics in September 1944 when he was appointed Minister of Foreign Affairs in Antti Hackzell's cabinet. He was sent to peace negotiations to Moscow to replace the head of the Finnish delegation, prime minister Hackzell, who had fallen seriously ill. As an outcome, Finland signed the Moscow Armistice which ended the Continuation War between Finland and Soviet Union. Enckell took part in the Paris peace conference in August and September 1946 as deputy chairman of the Finnish delegation and on 10 February 1947 he signed the Paris peace treaty as chairman of the delegation.