日独防共協定
In February 1939, the German military leadership, independent from the foreign ministry, increased the pressure on Bulgaria to join the Anti-Comintern Pact. "Generalmajor" Georg Thomas explained to the Bulgarian delegation during negotiations regarding German armament loans to Bulgaria that such loans could only be extended if Bulgaria made a clear political showing of alignment to Germany in form of joining the Anti-Comintern Pact. Weizsäcker complained to the Wehrmacht high command about this incident. Thomas subsequently claimed to Weizsäcker that he was acting on the direct orders of Hermann Göring. In a subsequent conversation between the Bulgarian delegate and Weizsäcker, it was made clear that Bulgaria was not in the situation to join the Anti-Comintern Pact at that time. Bulgaria wouldn't join the agreement until 25 November 1941.