The NBA has terminated its relationship with a Chinese-based basketball academy located in the controversial region of Xinjiang, according to a letter league executives sent to a U.S. senator. Sports Illustrated has obtained a copy of the letter, sent on Tuesday to Sen. Marsha Blackburn (R-Tenn.). The note was a response to a June 30th letter Blackburn penned to NBA commissioner Adam Silver over her concerns regarding the league’s relationship with the communist country.