Has Churchill said something like this?

History concerns itself with dry facts, but has less to say about human minds, and so it is difficult to know whether FDR and Churchill were fooled or whether they chose to be fooled. When FDR and Churchill praised Stalin’s integrity and sincerity, had they been deceived by the world’s greatest actor or did they allow themselves to be deceived so that the terrible compromises they made seemed more palatable?

Yet before 1940, the word most closely associated with Churchill was "opportunist."[8] He had twice changed his party affiliation — from Conservative to Liberal, and then back again.

Yet the time came when Churchill made his peace with Communism. In 1941, he gave unconditional support to Stalin, welcomed him as an ally, embraced him as a friend. Churchill, as well as Roosevelt, used the affectionate nickname, "Uncle Joe"; as late as the Potsdam conference, he repeatedly announced, of Stalin: "I like that man."[13] In suppressing the evidence that the Polish officers at Katyn had been murdered by the Soviets, he remarked: "There is no use prowling round the three year old graves of Smolensk."[14] Obsessed not only with defeating Hitler, but with destroying Germany, Churchill was oblivious to the danger of a Soviet inundation of Europe until it was far too late. The climax of his infatuation came at the November, 1943, Tehran conference, when Churchill presented Stalin with a Crusader's sword.[15]

Er...did you want to find out if the whole thing is a lie before you begin translating it?

Seems reasonably crucial to me.

Churchill said: "You can count on the Americans to do the RIGHT thing after they had tried everything else."