Axis Powers Trade

During the Second World War, the Axis Powers managed to performed trading, although in small numbers, but trade nonetheless. There have been reports and documents of German and Italian submariners trading with Japanese or docking in Japanese ports such as in Penang or Malaysia. As well as this, Nazi Germany and Imperial Japan work together in joint naval submarine operations in the Indian Ocean. Like the Monsun Gruppe. Also to point, is the Japanese even assisted the Vichy French in Madagascar in 1942. So could you go over and explain the joint naval Operations between the Axis Powers and trading between them? Like the journey, the attrition rate, what was being delivered, where did they dock, famous commanders, and did this have any major impact on the war itself? Hopefully this can be explained. Godspeed.