Sentence:  Splendid , too , is the performance of Yuri Tolubeyev , one of <WSD>Russia</WSD> 's leading comedians , as Sancho Panza , the fat , grotesque `` squire '' . 
Meaning of the word marked with <WSD> tags:  a former communist country in eastern Europe and northern Asia; established in 1922; included Russia and 14 other soviet socialist republics (Ukraine and Byelorussia and others); officially dissolved 31 December 1991