In Panzer Battles, von Mellenthin describes the psychology of the Russian soldier with an emphasis on its Asiatic foreignness:
No one belonging to the cultural circle of the West is ever likely to fathom the character and soul of these Asiatics, born and bred on the other side of the European frontiers.
(I am of course aware that the Slavs migrated into Russia from the west, and were originally a European people. But the Mongol invasion of 1241, and the two centuries of domination which followed, gave an Asiatic twist in the Russian outlook and character, a development accentuated by the policy of the Tsars.)
Yet the Russian character must contain the key to an understanding of their soldierly qualities, their achievements, and their way of fighting. The human heart, and the psychology of the individual fighting man, have always been the ruling factors in warfare, transcending the importance of numbers and equipment. This old maxim held good during World War II, and I think it will always to so.
The difficulty in understanding the Russian is that we do not take cognizance of the fact that he is not a European, but an Asiatic, and therefore thinks deviously. We can no more understand a Russian than a Chinaman or a Japanese, and from what I have seen of them, I have no particular desire to understand them, except to ascertain how much lead or iron it takes to kill them. In addition to his other Asiatic characteristics, the Russian has no regard for human life and is an all out son of bitch, barbarian, and chronic drunk.
He definitely did not see the Russians as true allies:
We promised the Europeans freedom. It would be worse than dishonorable not to see they have it. This might mean war with the Russians, but what of it? They have no Air Force anymore, their gasoline and ammunition supplies are low. I’ve seen their miserable supply trains; mostly wagons draw by beaten up old hoses or oxen. I’ll say this; the Third Army alone with very little help and with damned few casualties, could lick what is left of the Russians in six weeks. You mark my words. Don’t ever forget them… Someday we will have to fight them and it will take six years and cost us six million lives.