September 1943 saw the formal surrender of what Tripartite Pact nation, ending their participation in WWII?
Tripartite Pact Tripartite Pact The Tripartite Pact, also known as the Berlin Pact, was an agreement between Germany, Italy and Japan signed in Berlin on 27 September 1940 by, respectively, Joachim von Ribbentrop, Galeazzo Ciano and Saburō Kurusu. It was a defensive military alliance that was eventually joined by Hungary (20 November 1940), Romania (23 November 1940), Bulgaria (1 March 1941) and Yugoslavia (25 March 1941), as well as by the German client state of Slovakia (24 November 1940). Yugoslavia's accession provoked a "coup d'état" in Belgrade two days later, and Italy and Germany responded by invading Yugoslavia (with Bulgarian, Hungarian and
Tripartite Pact April. The German Air Force bombed Belgrade for three days and nights. German ground troops moved in, and Yugoslavia capitulated on 17 April. The Independent State of Croatia ("Nezavisna Država Hrvatska", or NDH) signed the Tripartite Pact on 15 June 1941. Just prior to the formation of the Tripartite Pact, the Soviet Union was informed of its existence, and the potential of its joining. Vyacheslav Molotov was thus sent to Berlin to discuss the pact and the possibility of the Soviet Union joining it. The Soviets considered joining the Tripartite Pact to be an update of existing agreements with Germany.