Solzhenitsyn was not a fan of Roosevelt and Churchill. From The Gulag Archipelago:
“In their own country, Roosevelt and Churchill are honored as embodiment’s of statesmanlike wisdom. To us, in our Russian prison conversations, their consistent shortsightedness and stupidity stood out as astonishingly obvious… what was the military or political sense in their surrendering to destruction at Stalin’s hands hundreds of thousands of armed Soviet citizens determined not to surrender.”
On Churchill handing over of the Cossacks:
“He [Churchill] turned over the Soviet command the Cossack corps of 90,000 men. Along with them he also handed over many wagon loads of old people, women, and children…This great hero, monuments to whom will in time cover all England, ordered that they, too, be surrendered to their deaths.”
Victors write the history books. Read this for another view.