MANILA: The Philippine military on Friday signed a pact with the US Navy to buy two secondhand C-130 transport planes to boost its capability to fan out quickly for territorial defense and humanitarian operations.

Washington has been helping develop the military capability of its former colony in the face of serious security challenges in the South China Sea, as China steps up its presence in disputed areas.

China claims almost all of the sea, believed to be rich in mineral and oil-and-gas deposits. Brunei, Malaysia, Vietnam, Taiwan and the Philippines also have claims on the waters, traversed by about $5 trillion of ship-borne trade each year.

“The United States is helping us pay for these two aircraft,” Col. Restituto Padilla, a spokesman for the Armed Forces of the Philippines, said, adding that the US State Department would provide about $20 million in foreign military financing.

“We have requested some 1.6 billion pesos to complete the purchase of the transport planes,” he added, referring to a sum equivalent to $35.61 million.

The transport planes, to be delivered early next year, will take to five the number of mission-ready C-130s, for a boost in the number and capacity of existing medium-lift aircraft.