Laird writes that the Ming appointed titles to eastern <answer>Tibet</answer>an princes, and that "these alliances with eastern <answer>Tibet</answer>an principalities are the evidence China now produces for its assertion that the Ming ruled <answer>Tibet</answer>," despite the fact that the Ming did not send an army to replace the Mongols after they left <answer>Tibet</answer>. Yiu Yung-chin states that the furthest western extent of the Ming dynasty's territory was Gansu, Sichuan, and Yunnan while "the Ming did not possess <answer>Tibet</answer>."
What does Yiu Yung-chin claim the Ming did not possess?
Tibet