Soviet head of state Joseph Stalin (L) shakes hands with German Nazi Foreign Minister Joachim Von Ribbentrop on 23 August 1939 in Kremlin in Moscow after the signing the Soviet-German Non-Aggression Pact, or Treaty of Non-aggression between Germany and the Union of Soviet Socialist Republics, making the outbreak of a European war virtually inevitable.

Should provide some interesting content for the show:

The site, called Prozhito, or Lived Through, was launched in 2015 and can be searched using the day, author or a keyword. It already includes more than 600 never-published journals. (source)