A recent research report on the growing economic integration between China and North Korea by the minority staff on the Senate Foreign Relations Committee has attracted a bit of media attention. Like most other government documents,this report—titled, “China’s Impact on Korean Peninsula Unification and Questions for the Senate”— languished in obscurity until The Washington Post wrote a story about it last week. The argument of the brief report is simple: China’s extensive growing economic interests in North Korea are effectively turning the Hermit Kingdom into a 21st-century “tributary province.” Consequently, Beijing will have both the incentive and capacity to block the future reunification of the two Koreas.