Russia bore the brunt of German aggression in WW2, at least from 1941 to 1945. Russia was keen the Allies landed in Europe, by which they mean France, to allieviate pressure on them. The Italian Campaign was always seen as a costly side-show, I suppose because of the difficulty of attacking Germany itself from Italy across the Alps. Therefore the Soviets saw Allied delays in attacking the French mainland as stalling for time (Which it wasn't) the British & Americans knew that any attack on the French coast would have to get it right first time.
The Allies wanted to preserve their front and not be split into two sections with the Germans between them.
By opening a second front the Allies would be able to draw off German strength from the Eastern Front and help relieve pressure upon the Russians .
It allowed the Second Reich (Germany) to transfer all of the forces it had allocated to the Eastern Front to the Western Front, thus making fighting more intense on the Western Front.
The Russians wanted the Allies to open a second front where German forces would be drawn off and the diversion of German military assets to another front other than the Eastern Front would help the Russian march to Berlin .
Establishes a second front on the European continent. This required Germany to divide it forces between fighting the Russian advance in the east and the US/Anglo avance from the west.
Teheran
The four different fronts in World War II were the Eastern Front (between Germany and the Soviet Union), the Western Front (between Germany and the Allies in Western Europe), the Pacific Front (between Japan and the Allies in the Pacific Ocean), and the African Front (primarily between Italy and the Allies in North Africa).
French North Africa : Operation Torch .
To start a second front for the allies and to help relieve the Soviets.
The Allies wanted to preserve their front and not be split into two sections with the Germans between them.
D-Day in June 6,1944.
By opening a second front the Allies would be able to draw off German strength from the Eastern Front and help relieve pressure upon the Russians .
Josef Stalin, leader of the Soviet Union
Stalin wanted the Allies to open a second front in Europe to releive pressure from his advancing army. If a second front was opened Hitler would have to split his forces and deal with two prongs that were advancing on Berlin and the Rhine, or the production heart of Germany. If either of these were taken Hitler would lose the war. The second front was made to put more pressure on Hitler and end the war quicker.
It allowed the Second Reich (Germany) to transfer all of the forces it had allocated to the Eastern Front to the Western Front, thus making fighting more intense on the Western Front.
The Russians wanted the Allies to open a second front where German forces would be drawn off and the diversion of German military assets to another front other than the Eastern Front would help the Russian march to Berlin .
A plan for the Western allies to open the second front in France in 1942.