between Greece, Turkey, Romania and Yugoslavia March 20 All German police forces come under the command of Heinrich Himmler. May 5 Soviet–Polish Non-Aggresion Pact is extented to December 31, 1945. June 30 Night of the Long Knives in Germany. Potential rivals to Hitler within the Nazi Party, including SA leader Ernst Röhm and prominent anti-Nazi conservatives such as, former Chancellor Kurt von Schleicher, are killed by the SS and the Gestapo. July 20 The SS becomes an organization independent of the Nazi Party, reporting directly to Adolf Hitler. July 25 Austrian Nazis assassinate Engelbert Dollfuss during the failed July Putsch against the Austrian government. August 2 Upon the death of President Hindenburg, Hitler makes himself Führer of Germany, becoming Head of State as well as Chancellor. August 8 Members of the Wehrmacht begin swearing a personal oath of loyalty to Hitler instead of to the German constitution. September The Soviet Union joins the League of Nations. October 9 King Alexander I of Yugoslavia and French foreign minister Louis Barthou are assassinated in Marseilles Alexander's political murder further destablized the Balkans. Barthou and Alexander were working for peace in Europe, particularly between Germany and The Soviet, as they prepared each France and Yugoslavia for war. October 16 Beginning of the Long March where the Chinese Red Army retreats to evade the pursuit of the Kuomintang forces. December 1 Sergei Kirov, head of the Leningrad Communist Party, is murdered by an unknown assailant, precipitating a wave of repression in the Soviet Union. December 5 The Abyssinia Crisis begins with the Walwal incident, an armed clash between Italian and Ethiopian troops on the border of Ethiopia. December 29 Japan renounces the Washington Naval Treaty and the London Naval Treaty. 1935 January 7 The League of Nations approves the results of the Saar plebiscite, which allows Saar to be incorporated into German borders. June 18 The Anglo-German Naval Agreement is signed by Germany and the United Kingdom. The agreement allows Germany to build a fleet that's 35% the tonnage of the British fleet. In this way, the British hope to limit German naval rearmament. August 31 The Neutrality Act of 1935 is passed in the United States imposing a general embargo on trading in arms and war materials with all parties in a war and it also declared that American citizens traveling on ships of warring nations traveled at their own risk. September 15