Christopher Johnson : D.C. , China face tense situation over dissident 's apparent transfer to U.S. custody . He says it has echoes of Tiananmen Square protests ; reflects nations ' human rights differences . He says recent tiffs have tested nations ' ties ; incident comes on eve of U.S.-China talks . Johnson : China 's internal conflicts , rise of corruption , politics make situation fraught .
Christopher Johnson : D.C. , China face tense moment over dissident 's apparent flight to U.S. protection . He says it has echoes of Tiananmen Square era ; reflects nations ' human rights differences . He says recent tiffs have tested nations ' ties ; incident comes on eve of U.S.-China talks . Johnson : China 's internal conflicts , rise of internet , help make situation fraught .