A U.S. Marine Base for Australia Irritates China

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The agreement with Australia amounts to the first long-term expansion of the American military’s presence in the Pacific since the end of the Vietnam War. It comes despite budget cuts facing the Pentagon and an increasingly worried reaction from Chinese leaders, who have argued that the United States is seeking to encircle China militarily and economically.

“It may not be quite appropriate to intensify and expand military alliances and may not be in the interest of countries within this region,” Liu Weimin, a Foreign Ministry spokesman, said in response to the announcement by Mr. Obama and Prime Minister Julia Gillard of Australia.

In an address to the Australian Parliament on Thursday morning, Mr. Obama said he had “made a deliberate and strategic decision — as a Pacific nation, the United States will play a larger and long-term role in shaping this region and its future.”

The president said the moves were not intended to isolate China, but they were an unmistakable sign that the United States had grown warier of its intentions.

China has invested heavily in military modernization and has begun to deploy long-range aircraft and a more able deep-sea naval force, and it has asserted territorial claims to disputed islands that would give it broad sway over oil and gas rights in the East and South China Seas.