The wartime alliance between Britain and the Soviet Union and the post-war mutual assistance and cooperation treaty are the further development of the Agreement on Action between Britain and the Soviet Union against Germany in July 194 1. It not only further clarified the wartime alliance responsibilities and obligations of the two sides, but also stipulated the basic principles of mutual assistance and cooperation between the two sides after the war for the first time. Therefore, determining the relationship between the two sides is not only of practical significance, but also of historical significance. When signing the treaty, Aidan said: "In the history of the relationship between our two countries, our alliance has never been so close, and our future mutual assistance obligations have never reached such a complete level. Molotov also pointed out that the contents of the Soviet-British Treaty "not only highlighted the great political importance to the development of diplomatic relations between the Soviet Union and Britain, but also to the future development of complex international relations in Europe as a whole", indicating that the friendly relations between the Soviet Union and Britain "have been substantially consolidated".