China has criticized the sail-past of a US warship close to an uninhabited reef in the South China Sea that China has occupied. The US and others contest China's territorial claims there.
The group Abu Sayyaf may be responsible for the kidnapping of two Canadians, a Filipino, and a Norwegian in the troubled southern region of the country.
And if he was, what does it mean?
China is embroiled in territorial disputes over an oil rig close to Vietnam and the arrest of Chinese fishermen in the Philippines, alarming its Southeast Asian neighbors.
Vietnam disputes China's right to drill for oil in waters that lie within Vietnam's exclusive economic zone. The Philippines has detained Chinese fishermen accused of collecting protected turtles.