Sentence:  Some time ago , however , Mr. Khrushchev decided that when bigger bombs were made , the <WSD>Soviet</WSD> Union would make them . 
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