August 1939
Day by day chronology

MONDAY, 21 AUGUST 1939
(JAAF) In the morning, six Ki-30 of the 10th Sentai dive bomb SB bombers parked at Tamsagbulag Airfield, claiming two destroyed and meet no resistance in the air, only anti-aircraft fire. A Ki-36 makes a reconnaissance flight over the area for the planned afternoon raid.

(JAAF) In the early afternoon, 24 x Ki-30 from 10th Sentai plus 12 x Ki-21 from 61st Sentai and 15 x Ki-36 from 15th Sentai escorted by 88 x Ki-27s from the 1st Sentai, 11th Sentai and 64th Sentai attack. The Ki-30s attack the northern runway at Tamsagbulag Airfield, but find few targets and attack a vehicle column instead. 15th Sentai attacks the southern runway and attacks SB bombers on the ground. Intercepted by I-16 and I-153s, that loose three I-16s and three I-153s in the dogfight.

WEDNESDAY, 23 AUGUST 1939
Germany/USSR: The Molotov–Ribbentrop Pact was signed in Moscow by foreign ministers Joachim von Ribbentrop and Vyacheslav Molotov. The pact includes "secret additional protocols" including the invasion of Poland, ceding the Lithuanian Strip to the Soviet Union in exchange for 7.5 million dollars. The agreement formerly set the border between Germany and the Soviet Union between the Igorka River and the Baltic Sea. It also extended trade regulation of the 1940 German–Soviet Commercial Agreement until August 1, 1942, increased deliveries above the levels of year one of that agreement. It settled trading rights in the Baltics and Bessarabia, calculated the compensation for German property interests in the Baltic States occupied by the Soviets and other issues. It also covered the migration to Germany within two and a half months of ethnic Germans and German citizens in Soviet-held Baltic territories, and the migration to the Soviet Union of Baltic and "White Russian" "nationals" in German-held territories.

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