After requesting a second front in Europe for almost 3 years, Stalin finally got his request in the form of D-Day. However, as far as I understand it, Stalin saw this as too little too late from Britain and the United States, as the USSR were already marching towards Berlin. So how did Stalin see D-Day? Was it greeted with delight as the invasion he had dreamed of? Or did he simply view it as a case of the west invading at the last possible moment, when victory was all but assured?
While you wait for a more complete answer, you might be interested in a past post on the topic:
There were two suggestions for D-day: the one we know and one supported by Churchill which went through the Balkans.
Considering the regional significance of the Balkans to the Soviets, it's likely that Stalin was pleased with the outcome we saw (France) as the conflict did not interfere with his satellites when the alternative most definitely would have done, nor did it enter the proximity of them.