The Tokhtamysh–Timur war was fought from 1386 to 1395 between Tokhtamysh, khan of the Golden Horde, and the warlord and conqueror Timur, founder of the Timurid Empire, in the areas of the Caucasus mountains, Turkistan and Eastern Europe. The battle between the two Mongol rulers played a key role in the decline of the Mongol power over early Russian principalities.

The Golden Horde never recovered from this war. In the middle of the 15th century, it fragmented into smaller khanates: the Kazan khanate, Nogai Horde, Qasim Khanate, Crimean Khanate and Astrakhan Khanate. Thus Tatar-Mongol power in Russia was weakened and in 1480 the 'Tatar yoke' over Russia, a reminder of the bloody Mongol conquest, was definitively shaken in the Great standing on the Ugra River.