HONG KONG — Territorial disputes between China and Vietnam have triggered deadly anti-China protests in Vietnam this week. Thousands of Vietnamese rioted against an oil rig China placed in waters that Vietnam considers its own. On Friday, protests took place in the Philippines, which is also entangled in territorial disputes with Beijing. China’s move to station the oil rig in waters contested by Hanoi was followed first by skirmishes at sea. Then the confrontation moved inland as Vietnamese protested by the thousands in cities across the country and set fire to businesses believed to be Chinese-owned.