One of Hitlers greatest failures during the war was his failure to coordinate, cooperate and plan with his allies. How would the Germans have done, expecially early in the war (Norwegian campaign) if they had requested expeditionary fleets from Italy and Japan.
At the time that Italy declared war, the Regia Marina consisted of six capital ships. The four most modern of these ships were being re-equipped. Only the two oldest capital ships were in a state of operational readiness. In addition to the six capital ships, the Italians had 19 cruisers, 59 destroyers, 67 torpedo boats, and 116 submarines.
Japan started the war with 10 aircraft carriers, 184 submarines, and 12 battleships, including the Yamato and Musashi. (If anyone can get better numbers on any of the axis navies, it would be greatly appreciated)
If the Japanese and Italians sent expeditionary fleets to assist the Reichsmarine against the Royal Navy, how could things have happened differently? Maybe the Vichy France or Germany would capture the French Navy?