 Complete the following phrase:  While the Khan of the Golden Horde initially attempted to limit Moscows influence, when the growth of the Grand Duchy of Lithuania began to threaten all of Russia, the Khan strengthened Moscow to counterbalance Lithuania, allowing it to become one of the most powerful cities in Russia. In 1380, prince Dmitry Donskoy of Moscow led a united Russian army to an important victory over the Mongols in the 