If the Nazis had somehow negotiated a successful end to hostilities with the UK between 1940 and 1941, they could have become a stable power holding much of central Europe. The problem they faced was lack of oil - there isn't much central Europe. That forced the push east into the oil fields of the caucasus. The Japanese invasions were similarly triggered by the need for oil that could not be embargoed from them.
Barbarossa (invasion of USSR): June 1941
Pearl Harbor: December 1941.
If the Nazis had somehow negotiated a successful end to hostilities with the UK between 1940 and 1941, they could have become a stable power holding much of central Europe. The problem they faced was lack of oil - there isn't much central Europe. That forced the push east into the oil fields of the caucasus. The Japanese invasions were similarly triggered by the need for oil that could not be embargoed from them.