After the triumph on Kulikovo Field the lands of Northeast Russia in the end of XIV century gained an opportunity to form their own independent foreign policy under the aegis of Moscow.
As the Golden Horde dominion over Russia weakened and the Golden Horde itself fell apart into several khanates the Moscow Rulers mustered Russian Lands more and more actively.
Besides, the increase of power of Muscovy allowed them to carry out more active policy both in Russian-Horde and Russian-Lithuanian relations. The struggle of Moscow against the Livonian Order for the outlet to the Baltic Sea became more important in the second half of XV century.
In XV century the international authority of the Moscow State rose sharply. This was also promoted by significant changes, which occurred as a result of the Ottoman Empire expansion into Europe. After the fall of Constantinople under attacks of the Turks and dissolution of Byzantium, Moscow became the leader of the Orthodox world. This formed the basis of "Moscow - the Third Rome" conception.