Japan's strategy for the first phase of the East Asian War has been worked out. First, Japan had to master the resources of the expanded empire, then create the appropriate armed forces and provide them with everything they needed. After that, a defensive perimeter was created, which covered the empire from a retaliatory strike. For Yamamoto, it was extremely important to destroy the American fleet at the very beginning, so that the fleet would not have problems ensuring the advance of the army to the south.