the philippine army has released new photographs of chinese construction work in the south china sea as it launched giant war games with the united states involving 11,500 personnel that were partly aimed at warning china .
the philippines voiced alarm about chinese ` aggressiveness ' in the area as it launched the balikatan 2015 joint philippines and us military exercises .
the aerial images show intense recent chinese construction over seven reefs and shoals in the disputed spratly islands .