As of this writing, Dmitri Khristich is without question the greatest Ukrainian player (born and raised there) who ever existed in the National Hockey League.  The native of Kiev was a two-time NHL All-Star (1997 & 1999) and was a 70 Point scorer twice, once with the Washington Capitals and once with the Boston Bruins.  Khristich also played for Los Angeles and Toronto over his 811 Game NHL career.