Which Mongol khan led the first successful large-scale winter invasion of Russia in history?

See, the answer to this will be B atu:

:Batu (grandson of Genghis Khan) but operational control and effective command was by Subotai.

Genghis Khan died in 1227.

The full scale invasion of Russia took place in Winter 1237

The Mongol invasion of Russia - the invasion of the Mongol Empire on the territory of the Russian principalities in 1237-1240 years during the Western campaign of the Mongols (Kipchak campaign) 1236-1242, under the leadership of the chingisid Batu Khan and Subutai of the warlord.

So, answer : Batu Khan