Feng Zhenghu returns home

Feng Zhenghu, the Chinese human rights activist who camped out at Narita Airport in Tokyo for over three months to protest the refusal of Chinese authorities to allow him back to China, has returned to Shanghai. Here's the Washington Post story. In a moment of no doubt unintended irony, the mayor of Shanghai, Han Zheng, is said to have commented apropos of Feng's case that all those entering the country had to abide by Chinese laws and regulations. Apparently those guarding the entry gates, however, do not; no legal basis for refusing him entry was ever to my knowledge proffered by the government. If readers can think of any, please let me know in the comments.