Sentence:  Morrison points out that since our country is more urbanized than the <WSD>Soviet</WSD> Union or Red China , it is the most vulnerable of the great powers - Europe of course must be written off out of hand . 
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