The proposed landing and the opening of the second front was discussed at Yalta.

Chruchill actually favored the Allied landings from Yugoslavia? Roosevelt immediately saw that Stalin was more then just uncomfortable with such a notion and France was given the final ok.

As for the Eastern Front. Operation Bagration was to coincide with the D-day landings as to put as much pressure on Germany as possible. After a slight delay the assault for the complete destruction of Army Groupe Centre coincidentally started on June 22, 1944 exactly 3 years after Barbarossa.

I believe that the Soviet plan for execution would not have changed?

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The war against Russia will be such that it cannot be conducted in a knightly fashion. This struggle is one of ideologies and racial differences and will have to be conducted with unprecedented, unmerciful and unrelenting harshness. -Adolf Hitler