beijing chinese military aircraft carry drill western pacific xinhua state news agency say thursday bombers fighters south china sea naval air arm exercise warships chinese aircraft air force carry increase number drill far chinese shore past years recently focus self-ruled taiwan claim china near japan xinhua say dozens aircraft include bombers fighters early warn aircraft drill western pacific along warships give exact location exercise normal drill part annual plan accord international law norms aim specific country region xinhua say cite military exercise impact freedom navigation overflight area news agency add participation aircraft attach south china sea fleet imply could fly dispute south china sea china build airfields military facilities artificial islands unnerve region china claim south china sea strategic waterway trillion worth goods pass every year vietnam philippines malaysia taiwan brunei overlap claim china continue install high-frequency radar facilities use military purpose man-made islands south china sea u.s. think-tank say last week nl8n1oe7hr chinese aircraft drill western pacific