Nonsense.
Only Roosevelt groupies use that excuse.
"Between June 22, 1941, and January 31, 1942, the Germans had lost 6,000 airplanes and more than 3,200 tanks and similar vehicles; and no less than 918,000 men had been killed, wounded, or gone missing in action, amounting to 28.7 percent of the average strength of the army, namely, 3,2 million men.[33]
(In the Soviet Union, Germany would lose no less than 10 million of its total 13.5 million men killed, wounded, or taken prisoner during the entire war; and
the Red Army would end up claiming credit for 90 per cent of all Germans killed in the Second World War.)
Clive Ponting, 'Armageddon: The Second World War,' p. 130; Stephen E. Ambrose 'Americans at War,' p. 72. ”
And this, the only logical conclusion:
"....realistically middle sized
Germany could not defeat the much larger Ussr in the long term. Germany would have eventually surrendered to the western allies to prevent total occupation by the USSR ..."
So did the Red Army really singlehandedly defeat the Third Reich Stuff I Done Wrote - The Michael A. Charles Online Presence (comment)
Clearly, any explanation of Roosevelt's pro-Soviet policy cannot rely on the fear of Stalin quitting the war.
So...one more Liberal myth put to rest......yet the worship of Roosevelt continues unabated.
Liberalism is based on the unthinking acceptance of myth and fabrication.
Always.