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Hitler's popularity within Germany, and German support for the war, reached its peak when he returned to Berlin on 6 July from his tour of Paris.
Following the unexpected swift victory, Hitler promoted twelve generals to the rank of field marshal during the 1940 Field Marshal Ceremony.
On 27 September 1940, the Tripartite Pact was signed in Berlin by Saburō Kurusu of Imperial Japan, Hitler, and Italian foreign minister Ciano, and later expanded to include Hungary, Romania, and Bulgaria, thus yielding the Axis powers.
On September 27, 1940, ostensibly under Hirohito's leadership, Japan was a contracting partner of the Tripartite Pact with Germany and Italy forming the Axis Powers.
At the end of September 1940, the Tripartite Pact formally united Japan, Italy, and Germany as the Axis Powers.
On 18 December 1940, Hitler issued the directive to prepare for an invasion of the Soviet Union.