Two US carriers patrol West Philippine Sea (USNI News)

Two US aircraft carrier groups have started operations in the Philippine Sea, in what the Philippine government said was a demonstration of Washington’s “ironclad commitment” as the world awaits a ruling by a United Nations tribunal on Manila’s petition to invalidate China’s so-called nine-dash line in the South China Sea.

“It is a show of how invested they are to the cause of peace, freedom and stability in our region and how resolute they are in their ironclad commitment to the Philippines,” Defense spokesperson Peter Paul Galvez told the Inquirer by phone.

The Nimitz-class super carriers USS Ronald Reagan  and the USS John C. Stennis  strike groups commenced “dual carrier flight operations” in the Philippine Sea last month, although Galvez clarified they were not within the country’s territorial waters.

The US Pacific Command statement was accompanied by stunning photos of the two US Navy aircraft carriers and its Great Green Fleet, an initiative to use alternative fuel for its military ships that was launched earlier this year.

The Stennis and the Great Green Fleet had just come from a trilateral exercise called Malabar, which included the US and Indian navies, along with the Japan Maritime Self-Defense Force (JMSDF), before it linked up with the USS Ronald Reagan in the West Philippine Sea.

The Ronald Reagan is the US Navy’s only forward-deployed aircraft carrier.

Multiple strike group

“The ships and aircraft assigned to both strike groups began coordinated operations in international waters demonstrating the United States’ unique capability to operate multiple carrier strike groups in close proximity,” the US Pacific Command said in a statement.

“While at sea, the strike groups conducted air defense drills, sea surveillance, replenishments at sea, defensive air combat training, long range strikes, coordinated manoeuvres and other exercises,” it added.

The apparent show of force comes as The Hague-based UN arbitral tribunal is expected to hand down its verdict soon, a ruling largely expected to favor the Philippines.

Rear Adm. Marcus Hitchcock, commander of CSG 3, added that “no other Navy can concentrate this much combat power on one sea or synchronize the activities of over 12,000 sailors, 140 aircraft, six combatants and two carriers.” “It is truly impressive, and it is an important operational capability,” Hitchcock added.

Updated: 2016-07-02 — 20:13:57