Hey Guys,
Let's say that Nazi Germany never comes into being, or it does but Hitler dies along the way prior to the Second Great War.
So, Europe never implodes with a Second War and instead wanders along slowly recovering. However in the East the USSR has finished its Ten Year Plan, it's rapidly industrialised and... Well there's not much to do now really.
Without a Nazi ally, thus nothing to distract the Allies with, Stalin can't go on his conquering spree around Poland, the Baltic's, Rumania and Finland. IOTL the reason he did so was because Hitler was the focus of Allied attention, thus allowing him to do whatever he wanted.
However, what will happen ITTL? All attention will be on Stalin and his Soviet Union now, the problem? Well the problem is that now he cannot easily create a Soviet 'nationality', IOTL this came about when the Germans entered and started massacring left-right-and-centre, thus creating a unity within the USSR that'd be hard to create otherwise.
So, what will Stalin do? Everyone's wary of the Soviets, within the USSR the Ukrainians likely hate Stalin for the Holodomor for decades to come, especially without a German invasion to distract them. Will Stalin eventually decide to 'invade Europe'? In other words start attacking nations and the Europeans threatening and declaring war? Will he not try his luck? Might he even go east (Asia)?