The Soviet Union was by no means satisfied with the actions of the western Allies in 1943. The Soviets wanted very much for the western Allies to open a true “second front” in the west and were very unhappy when the Allies did not do so.
From 1941 to 1944, the Soviets were doing the huge majority of the actual fighting against the Germans. The German invasion of the USSR in 1941 involved tremendous numbers of people. The Soviets took heavy casualties and were close to being defeated at least until early 1943. Meanwhile, the Germans were essentially not being challenged in the west. The Soviets wanted a major invasion of Europe to divert German attention from them and ease the pressure on them.
Because of this, the Soviets were not particularly happy with what the western Allies actually did. They felt that the action in North Africa and the later invasion of Italy were insufficient to truly draw the Germans’ attentions. They felt that a more massive and more threatening invasion was needed. This is why the Soviets were not satisfied with the actions of their allies in 1943.