Which world leaders met at the tehran conference to discuss the invasion of german occuied france

Joseph Stalin, Franklin D. Roosevelt, and Winston Churchill.

Explanation:

The Tehran Conference was held between the leaders of the three allied forces. Joseph Stalin was representing the USSR, Franklin D. Roosevelt was representing the United States, and Winston Churchill representing the United Kingdom.

This conference was part of numerous conferences held by these three leaders.

The reason why this particular conference was held was to discuss the German actions, especially the invasion of France, and what should be done about it. Also, theme of discussion were the relations with Turkey and Iran in Asia, as well as Yugoslavia in Europe.

The end decision was that a second front should be opened up against the Germans so that they can be defeated and stopped in their aggression across the continent.