China on Wednesday asserted its right to control a newly designated air defence identification zone, but appeared to play down the impact of an incursion by two US B-52 bombers, according to DPA. Defence Ministry spokesman Geng Yansheng said China had monitored the US flight late Tuesday over the eastern edge of the zone. "The Chinese military conducted surveillance during the whole course, identified and ascertained the type of the US jets in time,"Geng said. "China has the ability to take efficient control of the relevant air space," he said.