Churchill was ecstatic that Russia and later the USA entered the war so he could let them do the work.
Roosevelt was probably ecstatic as well, though for less publicised reasons.
From ‘Warlords, the heart of conflict 1939 – 1945’ by Simon Berthon and Joanna Potts.
Page 131
But as the war ground on, Churchill began to see a new threat to Europe – the man who had become the third ally in the fight against Hitler, Joseph Stalin. In late 1942 he told Anthony Eden: ‘It would be a measureless disaster if Russian barbarianism overlaid the ancient state of Europe.’
Roosevelt thought otherwise. As far as he was concerned, the cause of war in the first place was the in fighting between Europe’s ancient, imperialist nations and he began to see in Stalin someone who would help him in his great cause of freeing the world of that Imperialism. Also in 1942, in a conversation with the Roman Catholic Archbishop of New York, he remarked: ‘The European people will simply have to endure Russian domination in the hope that – in ten or 20 years – the European influence will bring the Russians to become less barbarous.’
This is taken from ‘The Roosevelt Letters: Being the Personnel Correspondence of Franklin Delano Roosevelt, Vol.3: 1928 – 1945.
Would have been interesting, had Roosevelt lived to see if he would have handed Europe to the Soviets.