WASHINGTON, Feb 23 - China is "changing the operational landscape" in the East Vietnam Sea by deploying missiles and radar as part of an effort to militarily dominate East Asia, a senior U.S. military official said on Tuesday.

China is "clearly militarizing” the East Vietnam Sea, said Admiral Harry Harris, head of the U.S. Pacific Command, adding: "You'd have to believe in a flat Earth to think otherwise."

Harris said he believed China's deployment of surface-to-air missiles on Phu Lam (Woody) Island in Vietnam's Hoang Sa (Paracel) chain, new radars on Chau Vien (Cuarteron) Reef in the Southeast Asian country’s Truong Sa (Spratly) archipelago and its building of airstrips were "actions that are changing in my opinion the operational landscape” in the East Vietnam Sea.

Soon after he spoke, U.S. government sources confirmed that China recently deployed fighter jets to Phu Lam. It was not the first time Beijing sent jets there but it raised new questions about its intentions.

U.S. Navy Captain Darryn James, spokesman for U.S. Pacific Command, said China's repeated deployment of advanced fighter aircraft to Phu Lam continued a disturbing trend.

"These destabilizing actions are inconsistent with the commitment by China and all claimants to exercise restraint from actions that could escalate disputes," he said. "That's why we've called for all claimants to stop land reclamation, stop construction and stop militarization in the [East Vietnam Sea]."

But U.S. and Chinese foreign ministers signaled that despite disagreements over the East Vietnam Sea, they were near agreement on a U.N. resolution against North Korea for its recent nuclear and missile tests and stressed their cooperation on economic and other issues.

'Hegemony in East Asia'

Speaking before the meeting in Washington between Chinese Foreign Minister Wang Yi and U.S. Secretary of State John Kerry, Harris said China was escalating the situation in the East Vietnam Sea with new deployments. Asked about its aims, he said: "I believe China seeks hegemony in East Asia."

Responding to another question, Harris said Chinese DF-21 and DF-26 anti-ship missiles could pose a threat to U.S. aircraft carriers, but added the vessels were resilient and that the United States had "the capability to do what has to be done if it comes to that."

Harris also said he supported regular U.S. air and naval patrols to assert freedom of navigation in the East Vietnam Sea, a vital waterway through which more than $5 trillion in global trade passes every year.

At a news conference with Kerry, Wang said there had been no problems with freedom of navigation and China and countries of the Association of Southeast Asian Nations - several of which have competing claims with China - have “the capability to maintain stability” in the East Vietnam Sea.

He said militarization was not the responsibility of one party alone and added in apparent reference to U.S. patrols: "We don't hope to see any more close-up military reconnaissance, or the dispatch of missile destroyers or strategic bombers to the [East Vietnam Sea]."

'Escalatory cycle'

Kerry said steps by China, Vietnam and others had created an "escalatory cycle."

"What we are trying to do it break that cycle," he said.

"Regrettably there are missiles and fighter aircraft and guns and other things that have been placed into the [East Vietnam Sea] and this is of great concern to everyone who transits and relies on the [East Vietnam Sea] for peaceful trade," he added.

A U.S. think tank reported on Monday that China may be installing a high-frequency radar system on Chau Vien in Truong Sa that could significantly boost its ability to control the strategic sea.

Last Thursday, the United States accused China of raising tensions by its apparent deployment of surface-to-air missiles on Phu Lam. China has also built military-length airstrips on artificial islands in the East Vietnam Sea.

China's Foreign Ministry said ahead of Wang's visit that Beijing's military deployments in the East Vietnam Sea were no different from U.S. deployments on Hawaii.

China's Ministry of Defense said on its microblog on Tuesday that China had established "necessary defensive facilities" that were "legal and appropriate."