is released in movie theaters throughout the United States. August 19 – Adolf Hitler, after evaluating the pace of non-aggression negotiations with the Soviet Union, orders the Kriegsmarine to begin the opening operations for Fall Weiß, the invasion of Poland. The , along with the , as well as dozens of U-boats, cast off for their advance positions. Hitler spends the next few days worrying that the Russians will not come to terms in time for the rest of the invasion plans to unfold as scheduled. August 20 – Armored forces under the command of Soviet General Georgy Zhukov deliver a decisive defeat to Imperial Japanese Army forces in the Japanese-Soviet border war in Inner Mongolia. August 23 – The Molotov–Ribbentrop Pact is signed between Germany and the Soviet Union, a neutrality treaty that also agrees to division of spheres of influence (Finland, Estonia, Latvia, eastern Poland and Bessarabia (modern-day Moldova), north-east province of Romania to the Soviet Union; Lithuania and western Poland to Germany). Its annex reassigns Lithuania to the Soviet Union. August 24 – As details of the Molotov–Ribbentrop Pact become public, British Prime Minister Neville Chamberlain recalls the Parliament of the United Kingdom several weeks early. In a burst of legislation, the Emergency Powers (Defence) Act 1939 gives full authority to defence regulations, the British Royal Navy is to be put on a war footing, all military leave is to be cancelled, military reserve forces are to be called up, especially coast defence, radar and anti-aircraft units, and Civil Defence workers are placed on alert. In addition, the last British and French private citizens in Germany are advised to return home by their respective Governments. August 25 The German Foreign Ministry cuts off all telegraph and telephone communication with the outside world, in accordance with the plan for Fall Weiß. At approximately 1830 Central European time, Adolf Hitler postpones Fall Weiß for 5 days, after receiving a message from Benito Mussolini that he will not honor the Pact of Steel if Germany attacks Poland, and because Chamberlain's government has not fallen as a result of the German-Soviet Non-Aggression Pact. Some units already in their forward positions (the attack is scheduled for 0430 the next day) do not get the word in time and attack various targets along the border. This same day, Neville Chamberlain gives Edward Rydz-Śmigły his "ironclad guarantee" of assistance if Poland is attacked by