Five years after U.S. President Barack Obama committed to a strategic rebalance to Asia, shifting diplomatic and military resources to the globe's economic engine, critics say the move was oversold and, so far, it has under delivered.

At a time when Beijing's assertive moves to claim territory in the South China Sea draw headlines and worried responses from regional countries, some say China appears to be outmaneuvering its rivals in the race to assert claims over the vast strategic sea.

"As somebody sitting in the Asia Pacific region and observing the U.S. presence in the Asia Pacific, we've only seen glimmers of the rebalance," said William Choong, a Shangri-La Dialogue senior fellow for Asia-Pacific Security in Singapore.

For decades, the U.S. Navy has protected key shipping routes in the Pacific.

The U.S. Navy is still the supreme ocean power, but China has moved to enforce its claims and expand its presence in the South China Sea - without putting its official military forces in the foreground.

"China's cutting edge has been through a gray area of Coast Guard, paramilitary forces, and even the construction on the artificial islands is being masked as serving the public good, search and rescue, scientific activities, oil exploration and fishing," said Southeast Asia security analyst Carlyle Thayer with Australia's Defense Force Academy in Canberra, adding that China already has more coast guard ships than all the other nine ASEAN nations combined.

Reclaims land

In the last two years China has reclaimed at least 1,170 hectares of land in the South China Sea, building upon small reefs, shoals and islets.

This week came another reminder of their efforts to fortify their existing outposts: the U.S. said China appeared to have deployed HQ-9 surface-to-air missile batteries on Woody Island in the Paracel chain, drawing official protest from Vietnam and expressions of concern from U.S. naval brass.

Speaking at the annual WEST Conference in San Diego on Thursday,U.S. Pacific Fleet Commander Adm. Scott Swift said China has twice previously deployed HQ-9 surface-to-air missiles on Woody Island for missile defense exercises, including exercises to shoot down unmanned aircrafts.

This week's absence of such exercises, he said, should alert the U.S. about Beijing's intentions, but that South China Sea differences between China and the U.S. should be resolved via diplomacy, and that navies of both countries should try to prevent tactical miscalculation from becoming strategic confrontation.

With the weapons and military infrastructure Beijing is stationing on the man-made islands being built in disputed waters, some more than 800 kilometers from the mainland, China is gaining both a quick strike capability and naval superiority over other countries in the region.

"In the past we have seen them conduct training in that part of the Paracels that involve this kind of equipment," Pentagon Press Secretary Peter Cook told reporters Friday.

"We still have significant concern about this particular placement at this particular moment in time," he said, adding the move only serves to make the current tensions worse.

ASEAN'S muddled response

The U.S. military has built closer ties with ASEAN nations, in particular Vietnam and the Philippines, which have contested China's territorial claims.

That has not meant, however, that ASEAN has banded together to address the South China Sea issue. ASEAN, with its emphasis on consensus building and non-interference, has been reluctant to publicly stand with the U.S. to support any meaningful action against China.

"ASEAN countries haven't really asked of Uncle Sam what they want Uncle Sam to do," Choong said.

Still, American influence in the region has increased as a result of Obama's commitment to more fully engage with Southeast Asia and to personally participate in annual forums like the East Asia Security summit, Southeast Asia security analyst Thayer said.

"Obama is leaving a legacy that a new American president would ignore at their peril," he said.

US buildup

In recent years, Washington has been moving more troops and military assets into the region and strengthening security alliances with a number of ASEAN members.

Admiral Harry Harris, commander of the U.S. Pacific Fleet, said the Navy has already brought its "newest and most capable" military equipment to the area, like the P-8 surveillance airplane, the Littoral Combat Ship, the Virginia-class submarine, and new amphibious ships such as the USS America.

In Australia last year, over 1,000 U.S. Marines were deployed to the city of Darwin to join in exercises with Australian Defense Forces. By 2017, the number of rotational deployments will increase to 2,500.

The Philippines' Supreme Court recently endorsed a bilateral security cooperation agreement that will station U.S. troops and weapons on a rotational basis at five Philippine military airfields and two naval bases.

The return of the U.S. military to the Philippines is seen by supporters as a significant deterrent to China and comes 25 years after Manila voted to close U.S. military bases in the country at the end of the Cold War.

Washington is also providing maritime assistance to other ASEAN nations, including Vietnam, which is receiving several refurbished U.S. Coast Guard patrol ships.

These increased capabilities in Southeast Asia are complemented by extensive U.S. military bases and deployments in Guam, Japan and South Korea.

Source: Voice of America