What If......

Then Stalin would have broken it. Hitler never entended to keep the pact anyway, it was just a means to keep the cost of victory down.

It might have influenced the Japanese, who were not certain, even as late as December, 1941, whether or not they would re-commence hostilities with the Soviet Union. I doubt they would have, however--quite apart from what such a war would have meant if Stalin were not distracted by a German invasion. After they began their "southern operation," they had more than enough on their plate.

Hitler had already indicated in My Struggle that his intention was to find "living space" for "his people" in the east. He had his eye on the Ukraine before he ever came to power.

If he had delayed a year it would have been to Hitler's advantage. He could have consolidated his hold on the Mediterranean possibly gained the Middle east and further isolated Britain. In doing so he would have flanked Russia making Stalin's position all the more precarious.