Hitler met with Molotov in Nov. 1940 to try to prevent war with the Soviet Union. But Molotov pretty much spat in Hitler's eye, and that was that.

http://www.fpp.co.uk/books/Hitler/2001/HW_Web_dl.pdf

Not since his talks with the British before Munich, in , had Adolf Hitler heard such tough language as Molotov used on November  and .As Ribbentrop had done before him, Hitler harangued the Russian ministeras though he were at a Party rally: if Russia wanted to share in the booty as the British Empire fell apart, then now was the time to declare Soviet solidarity with the Tripartite Pact powers. He sympathised, he said, with Russia’s desire for an outlet to the high seas, and suggested that she should expand southward from Batum and Baku toward the Persian Gulf and India; Germany would expand into Africa. As for Russia’s interest in the Dardanelles, Hitler restated his willingness to call for the renegotiation of the Montreux Convention, which governed the straits, to bring it into line with Moscow’s defensive interests.
The demands which Molotov stated were shockers. Russia wanted another stab at Finland – she intended to occupy and annex the whole country,which had, after all, been assigned her by the  pact which he had signed with Ribbentrop in Moscow. Hitler, however, needed Finland’s nickel and timber supplies. When Molotov announced Russia’s intention of inviting Bulgaria to sign a non-aggression pact which would permit the establishment of a Soviet base near the Dardanelles, Hitler ironically inquired whether Bulgaria had asked for such assistance; pressed later by Molotov for a reply to Soviet terms, Hitler evasively answered that he must consult Mussolini! Each of Molotov’s conferences with Hitler was terminated by the warning of approaching British aircraft, and his dinner at the Soviet embassy on the thirteenth ended abruptly for the same reason. Ribbentrop invited Molotov to the concrete shelter at his home; here the Soviet foreign minister revealed that Moscow could never entirely forgo an interest in the western approaches to the Baltic either – the Kattegat and Skagerrak. When Ribbentrop told his Führer of this, Hitler was stunned. ‘He demanded that we give him military bases on Danish soil on the outlets to the North Sea,’ Hitler was to recall in the last week of his life. ‘He had already staked a claim to them. He demanded Constantinople, Romania, Bulgaria, and Finland – and we were supposed to be the victors!’
While the public was deliberately fed the impression that the formal Nazi–Soviet discussions had been harmonious and successful, within the chancellery there was no doubt that they had reached the parting of the ways. Irrevocable and terrible in its finality, the decision which Adolf Hitler
now took was one he never regretted, even in the abyss of ultimate defeat.
 

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