Both Giovanni Villani, famous merchant chronist in Florence and some Russian Chronicles agree that pestilence had already killed mass of Mongols as well as Turk nomads before its arrival in Crimean Peninsula.

 

'But there were uncountable death in Turkey and other countries overseas, where the disease lasted longer and did the most harm. God's justice fell harshly upon the Tartars (Mongols), so much so that it seemed incredible'.

Quoted From: Doc. no. 3 (Villani, Chronica), in John Aberth (ed.), The Black Death: The Great Mortality of 1348-1350. Basingstoke: Palgrave MacMillan, 2005, p.19.

According the Quotation in Benedictow's The Black Death 1346-1353, the narrative of a certain Russian Chronicle states as following:

'In the same year [1346], God's punishment struck the people in the eastern lands, in the town Ornach [on the estuary of the River Don], and in Khastorokan, and in Sarai, and in Bezdezh [at an arm of the River Volga], and in other towns in those lands; the Mortality was great among the Bessermens, and among the Tartars, and among the Armenians and the Abkhazians, and among the Jews, and among the European Foreigners [Geonese and Venetians], and among the Circassians, and among all who lived there, so that they could not bury them [sic]'.

From: Vasil'ev, K. G. & A. E. Segal (ed.), Istorya epidemiy i Rosii, Moskow, 1960, p.29 [quoted as English translation from Russian, in: Ole J. Benedictow, The Black Death, 1346-1353: The Complete History, Woodbridge: Boydell, 2005, p.50.]