From the German Propaganda Archive:
It is astonishing, hardly believable, how the state of the world can change entirely within a short time. Modern war speaks its own language, and ideas and principles that twenty years ago were standard military theory and practice are now entirely outdated and antiquated. If one compares the world situation of Sunday, 7 December, the day when Japan gave President Roosevelt the appropriate answer to his impudent provocations and shameless affronts, with today, one will without doubt conclude that the position of the Axis powers has improved in a way that even a few days before military and political experts would have thought highly improbable.
All the confident predictions of the U.S.A. and England have collapsed. Those in Washington apparently thought the patience and untiring persistence of Japanese negotiators were signs of weakness. They were so surprised by the sudden attacking spirit of the Japanese army that they as yet have found no plausible explanation for what happened. The national enthusiasm, patriotic passion, and devotion of a military people have once again won a great triumph, while the liberal-democratic jugglers find themselves amidst the ruins of many of their vague hopes and dreams.
“The enemy of my enemy is my friend,” and so on. Of course, we know how that turned out for the USSR. I’m betting that in the alternate universe where Germany conquered Europe and the Soviets, Japan would have been pretty high up on the list of places to invade next.