I don't and won't second guess FDR at Yalta. But this quote from the article says it all as far as I'm concerned. The US was not equipped to do what's described above. The war had taken a tremendous toll on all involved. The only other option was to nuke Moscow which was not a decision to be taken lightly. After VE day with the Russians being just as big heroes as the Americans, it would have been very hard to do. The American public would have never accepted this immediately after WWII. By the time the real threat of Communism was apparent it was too late.
I believe the apology is very valid and that the commies (both here and abroad) never owned up to their complicity in starting the war.