Board Thread:Timeline Discussions/@comment-7559950-20130911012534/@comment-4758513-20131009003655

As I understand it, Franco was deathly afraid of an Allied invasion. His demands for entering the war on the Axis side was Gibralter, parts of southern France, and French Morocco, in addition to large amounts of German troops and supplies, which Hitler wanted for the Eastern Front. He also had aspirations to annex Portugal.

Due to these massive demands, Hitler and Franco disagreed, and Spain remained neutral for the rest of the war.

Can't really say about the Soviet Union. I think the Axis proposed it, but I doubt it would last, given the Nazis' intentions.