Nevertheless, the years following the great victory at Kulikovo saw a reversal of its results. In fact, only two years later, in 1382, the Mongols
came back, led this time by the able Khan Tokhtamysh. While the surprised Dmitrii was in the north gathering an army, they besieged Moscow and, after assaults failed, managed to enter the city by a ruse: Tokhtamysh swore that he had decided to stop the fighting and that he and his small party wanted to be allowed within the walls merely to satisfy their curiosity; once inside, the Mongols charged their hosts and, by seizing a gate, obtained reinforcements and hence control of Moscow, which they sacked and burned. Although Tokhtamysh retreated, with an enormous booty, rather than face Dmitrii's army, the capital and many of the lands of the principality were desolated and its resources virtually exhausted. Dmitrii, therefore, had to accept the overlordship of the Mongol khan, who in return confirmed him as the Russian grand prince. Still, after Kulikovo, the Mongol grip on Russia lacked its former firmness. Dmitrii Donskoi spent the last years of his reign in strengthening his authority among Russian princes, especially those of Tver and Riazan, and in assisting the rebuilding and economic recovery of his lands.
When Dmitrii Donskoi died in 1389 at the age of thirty-nine, his son Vasilii, or Basil, became grand prince without challenge either in Russia or in the Golden Horde. Basil I's long reign, from 1389 until his death in 1425, deserves attention for a number of reasons. The cautious and intelligent ruler continued very successfully the traditional policy of the Muscovite princes of enlarging their own principality and of making its welfare their first concern. Thus, Basil I acquired several new appanages as well as a number of individual towns with their surrounding areas. Also he waged a continuous struggle against Lithuania for western Russian lands. Although the warlike Grand Prince Vitovt of Lithuania scored some victories over his Russian son-in-law, Basil's persistent efforts led to a military and political deadlock in much of the contested area. It might be noted that, after the conclusion of a treaty with Lithuania in 1408, a number of appanage princes in the western borderlands switched their allegiance from Lithuania to Moscow.
Relations with the East presented as many problems as relations with the West. In 1395 Moscow barely escaped invasion by the army of one of the greatest conquerors of history, Tamerlane, who had spread his rule through the Middle East and the Caucasus and in 1391 had smashed Tokhtamysh. Tamerlane's forces actually devastated Riazan and advanced upon Moscow, only to turn back to the steppe before reaching the Oka river. Around 1400 Muscovite troops laid waste the land of the Volga Bulgars, capturing their capital Great Bulgar and other towns. In 1408 the Golden Horde, pretending to be staging a campaign against Lithuania, suddenly mounted a major assault on Moscow to punish Basil I for not paying tribute and for generally disobeying and disregarding his overlord. The Mongols devastated the principality, although they could not capture the
city of Moscow itself. In the later part of his reign, Basil I, preoccupied by his struggle with Lithuania and Tver, maintained good relations with the khan and sent him "gifts."
The death of Basil I in 1425 led to the only war of succession in the history of the principality of Moscow. The protagonists in the protracted struggle were Basil I's son Basil II, who succeeded his father at the age of ten, and Basil II's uncle Prince Iurii, who died in 1434 but whose cause was taken over by his sons, Basil the Squint-eyed and Dmitrii Shemiaka. Prince Iurii claimed seniority over his nephew, and he represented, in some sense, a feudal reaction against the growing power of the grand princes of Moscow and their centralizing activities. By 1448, after several reversals of fortune and much bloodshed and cruelty - which included the blinding of both Basil the Squint-eyed and of Basil II himself, henceforth known as Basil the Blind - the Muscovite prince had prevailed. Dmitrii Shemiaka's final rebellion was suppressed in 1450. Indeed, having obtained sufficient support from the boyars and the people of Moscow, Basil II managed, although at a very heavy cost, not only to defeat his rivals but also to expand his principality at the expense of Basil the Squint-eyed and Dmitrii Shemiaka and also of some other appanage princes.
Relations with the Mongols continued to be turbulent as the Golden Horde began to break up and Moscow asserted its independence. In 1445 Basil II was badly wounded and captured in a battle with dissident Mongol leaders, although soon he regained his freedom for a large ransom. The year 1452 marked a new development: a Mongol prince of the ruling family accepted Russian suzerainty when the princedom of Kasimov was established. Basil II had taken into his service Mongol nobles with their followers fleeing from the Golden Horde, and he rewarded one of them, Kasim, a descendant of Jenghiz Khan, with the principality for his important assistance in the struggle against Dmitrii Shemiaka. The creation of this Mongol princedom subject to the grand prince of Moscow was only one indication of the decline of Mongol power. Still more significant was the division of the vast lands held directly by the Golden Horde, with the Crimean khanate separating itself in 1430, that of Kazan in 1436, and that of Astrakhan in 1466 during the reign of Basil II's successor, Ivan III. In 1475 the Crimean state recognized Ottoman suzerainty, with Turkish troops occupying several key positions on the northern shore of the Black Sea. Of course, the khans of the Golden Horde tried to stem the tide and, among other things, to bring their Russian vassal back to obedience. Khan Ahmad directed three campaigns against Moscow, in 1451, 1455, and 1461, but failed to obtain decisive results. For practical purposes, Moscow can be considered as independent of the Mongols after 1452 at least, although the formal and final abrogation of the yoke came only in 1480. In fact, Vernadsky regards the establishment of the principality of Kasimov as a decisive turning point in
the relations between the forest and the steppe and thus in what is, to him, the basic rhythm of Russian history.
Basil II's long reign from 1425 to 1462 also witnessed important events in Europe which were to influence Russian history profoundly, although they did not carry an immediate political impact like that implicit in the break-up of the Golden Horde. At the Council of Florence in 1439, with Byzantium struggling against the Turks for its existence and hoping to obtain help from the West, the Greek clergy signed an abortive agreement with Rome, recognizing papal supremacy. The Russian metropolitan, Isidore, a Greek, participated in the Council of Florence and, upon his return to Moscow, proclaimed its results during a solemn service and read a prayer for the pope. After the service he was arrested on orders of the grand prince and imprisoned in a monastery, from which he escaped before long to the West. A council of Russian bishops in 1443 condemned the Church union, deposed Isidore, and elected Archbishop Jonas metropolitan. The administrative dependence of the Russian Church on the Byzantine came to an end. Furthermore, many Russians remained suspicious of the Greeks even after they repudiated the very short-lived Union of Florence. Then in 1453 Constantinople fell to the Turks, who proceeded to acquire complete control of the Balkan peninsula and of what used to be the Byzantine Empire. As we know, it was with Byzantium and the Balkan Slavs that ancient Russia had its most important religious and cultural ties, in the appanage period as well as in the days of Kiev. The success of the Turks contributed greatly to a weakening of these ties and, therefore, to a more complete isolation of Russia. As we shall see, it also strengthened Muscovite xenophobia and self-importance and various teachings based on these attitudes. It should be noted that this boost to Muscovite parochialism occurred at the very time when the northeastern Russian princedom was being transformed into a major state that was bound to play an important role in international relations and was in need of Western knowledge.