The following is from an important source.

Influential personages amongst the military authorities here are beginning to voice their regret that the defeat of Germany was so thorough on the grounds that there is now no barrier to Russian expansion. They think that at some stage in the conflict they should have pulled out so as to leave Germany and Russia more evenly matched. Some say that they should have switched to Germany's side at some time though that would have been impossible because of public feeling. They say that Mr. Roosevelt realised too late that it would be a disaster to bring about a situation which would leave Russia master of the field and that it was this realisation which killed him.