ISTANBUL—Turkey raised the issue of Uyghur Muslims during talks with China’s foreign minister in Ankara on Thursday, Turkish Foreign Minister Mevlut Cavusoglu said, as hundreds of Uyghurs protested against the treatment of their ethnic kin in China. Chinese Foreign Minister Wang Yi met Cavusoglu and later President Tayyip Erdogan, as around 1,000 protesters gathered in Istanbul, chanting “Dictator China” and “Stop Uighur Genocide, Close the Camps.” Some waved blue-and-white flags of the independence movement of East Turkestan, the name by which the movement refers to Xinjiang. “We are here to ask about our families. Why can’t we get in touch with our families? Are they dead or alive? Where are they? Are they at camps or outside?” said Imam Hasan Ozturk, a Uyghur protester. China approved an extradition treaty with Turkey in December and with the deal awaiting ratification by Ankara’s parliament, activists among some 40,000 Uyghurs living in Turkey …