I think it is important that Canada make no sign of accepting the Chinese Government claim that Canadian citizenship acquired by refugees from China is invalid. So regardless of "success or failure" Canadian diplomats should just remain in Urumqi as a objective gesture of protest. After reading the Chinese MFA press briefing I realize that this is also about the Chinese authorities unhappiness that we give refugee status to people from the PRC that are deemed to be at risk of political persecution if returned to China.
The Chinese language release posted below uses word "nanmin" (refugee) and reads in part:
"Yushanjiang was born in Xinjiang. In 2001 he was accepted by Canada as a refugee. In 2006 while in Uzbekistan he was arrested by the Uzbeki authorities. He was deported back to China on the grounds of suspicion that he participated in terrorist activities" Yushanjiang is Celil's Chinese name. The reference to being accepted by Canada as a refugee is not a random comment in there in my view.