alt Hacker NewsWW2 ended with Yalta conference where Roosevelt agreed to Stalin's proposition of giving Poland to USSR's sphere of influence, making Poland (and rest of EE) their puppet state.
Churchil wanted to pressure Stalin to leave Poland (and at least parts of EE) independent and even considered "Operation Unthinkable".
At least that's what I think the guy above referenced.
That's pretty much what happened. Trouble was the stakes were already high, if Starlin didn't yield to a bluff (had one been pursued) it would have been an embarrassing backdown and a show of weakness on part of the allies.
"Bluff" because no one other than perhaps Stalin would have followed through—to essentially extend WWII (this time between former allies).
So pragmatism was the order of the day, thus Poland and EE were sacrificed.