Answer:
The Tripartite Pact, also known as the Berlin Pact
Step-by-step explanation:
The Tripartite Pact was an agreement between Germany, Italy, and Japan signed in Berlin on 27 September 1940 by, respectively, Joachim von Ribbentrop, Galeazzo Ciano and Saburō Kurusu. It was a defensive military alliance that provided mutual assistance should any of the signatories suffer attack by any nation not already involved in the war.