TOKYO -- China has initiated a potentially dangerous escalation of activities around the Japan-controlled Senkaku Islands, entering the area around the chain -- which Beijing claims as the Diaoyu -- for the apparent reason of territorial defense.
Recent helicopter incursion may show intent to defend territory Beijing claims

A China Coast Guard vessel and helicopter in waters near the Senkaku Islands on May 3. (Japan Coast Guard)
TOKYO -- China has initiated a potentially dangerous escalation of activities around the Japan-controlled Senkaku Islands, entering the area around the chain -- which Beijing claims as the Diaoyu -- for the apparent reason of territorial defense.