While the German Reich had entered an era of peace, prosperity, and expansion as the newfound global hegemon. Its allies were in the midst of fighting over who would become the number two power in the world.
Japan was defeated. Their rebuilt industry served no purpose other than the civilian market, which only further increased the wealth of Germans, as it was the German nation who invested heavily in Japan's reconstruction.
Since The Japanese Armed Forces had been limited to a small number of troops for self defense only, it was only natural that the various other Empires of the world were now clamoring for their former position. The Byzantine Empire had been preparing for the last five years for the eventual invasion and annexation of its neighbors, but they were not alone in this regard.