Muscovy had been one of the tributaries of the Mongols, who sacked Kiev in the 1230s, after pouring into Russia and what now is Ukraine.

俄国曾是蒙古的进贡国之一,1230年代,蒙古人洗劫了基辅,蒙古铁骑涌入俄国以及现在的乌克兰

耶鲁公开课 - 欧洲文明课程节选