Chinese authority says peace and stability in South China Sea was directly related to prosperity and development of countries in the region.
Philippines defence minister, who is at the summit in Vientiane, orders the release of photographs.
Defence Secretary Delfin Lorenzana says a Philippines air force plane spotted more boats than usual in a flotilla on Saturday.
President Duterte is scheduled to meet US President Barack Obama at a regional summit in Laos on Tuesday.
Separatists say that they would surely consider the creation of "safety zones" which is proposed by the Thai government.
Philippine Foreign Minister Perfecto Yasay says they are trying to convince China on the UN-backed tribunal ruling.
The foreign ministers are expected to discuss regional issues and disputes in the meeting.
Director-General Ronald dela Rosa says officers are also accused of protecting syndicates involved in the manufacture and distribution of narcotics.
The police found a bomb and "high (impact) explosive materials" during a raid on the suspect's house.
The Japan foreign ministry says in a statement that the Chinese ships' "incursion" violated Japan's sovereignty.
UN has repeatedly condemned the deaths of the suspected drug dealers and users as a violation of human rights.
Melanie Guerin's body was sent for an autopsy to Kathmandu in order to find out the cause of her death.
Thai deputy national police spokesman Kissana Phatanacharoen says only one warrant of arrest was issued for a suspect in connection with the attacks.
Japanese media reports that Beijing has built a dock for its warships at a site, which Japan is developing as a military base.
BRP Tubbataha is the first of 10 Philippine coast guard ships being built in Japan and supported by Japanese aid.