According to MANA, A surge in piracy off parts of the Philippines is forcing ship-owners to divert vessels through other waters, pushing up costs and shipping times.
Duterte said piracy in the Sulu Sea between eastern Malaysia and the southern Philippines would escalate to levels seen in Somalia, and raise insurance costs for firms and increase prices of consumer goods and services.
"We would be glad if they have their presence there ... just to patrol," Duterte said, adding that China could send coastguard vessels, not necessarily "gray" warships.
The Philippines, Malaysia and Indonesia had an agreement to patrol and tackle the Abu Sayyaf in the Sulu and Celebes Sea after they kidnapped the crew of Indonesian and Malaysian tug boats and South Korean and Vietnamese merchant ships.