BRISBANE, Australia (AP) — With 
an eye on China, President Barack Obama and the prime ministers of Japan
 and Australia are poised to commit their countries to closer 
cooperation on security in the Asia Pacific region.
But their 
scheduled meeting Sunday, the first since 2007 among leaders of the 
three allies, risked antagonizing Beijing after a week when Obama 
reached a surprising level of consensus with Chinese President Xi 
Jinping on climate change and trade, and Japan and China took steps to 
improve their relationship.
China
 has viewed Obama's efforts to deepen alliances with other countries in 
the region, particularly on security issues, as an attempt to counter 
Beijing's rise.
White House 
officials insisted that the three-way talks on the sidelines of the 
Group of 20 economic summit were not meant to send a message to China.
But
 in advance of Obama's meeting with Japan's Shinzo Abe and Australia's 
Tony Abbott, the president pressed China to "adhere to the same rules as
 other nations — whether in trade or on the seas."
"By
 virtue of its size and its remarkable growth, China will inevitably 
play a critical role in the future of this region," Obama said Saturday 
in a speech at the University of Queensland. "And the question is, what 
kind of role will it play?"
An Obama administration 
official said the three-way meeting had been in the works for a year and
 that agreements were expected on increasing military cooperation and 
helping countries in Southeast Asia bolster their maritime capacity.
Also
 expected was an announcement on cybersecurity, a further source of 
tension between the U.S. and China. Ebola and Islamic State militants 
were additional topics planned for discussion.
Australia was 
Obama's last stop on a weeklong trip that began in China and Myanmar. He
 arrived politically weakened at home by the Democratic Party's election
 defeats Nov. 4. The president has tried to show the region's leaders 
that he retained the ability to deliver on promises to deepen U.S. 
engagement in Asia and the Pacific, an effort he sees as a central part 
of his foreign policy.
"There
 are times when people have been skeptical of this rebalance, they're 
wondering whether America has the staying power to sustain it," Obama 
said. "I'm here to say that American leadership in the Asia Pacific will
 always be a fundamental focus of my foreign policy."
In
 China, he emerged with an ambitious agreement to reduce greenhouse gas 
emissions, as well as a deal to extend visa lengths and move forward on 
tariff reductions on high-tech goods.
But despite those areas of
 agreement, there are major sources of tension between the powers, 
particularly Beijing's provocative actions in territorial disputes in 
waters off its borders.
The 
conflict between China and Japan over a string of uninhabited islands in
 the East China Sea has been intense, with Beijing setting up an air 
defense zone over the area last year that was denounced by the U.S.
During
 a trip to Tokyo this year, Obama pledged to fulfill America's treaty 
obligations to defend Japan if it were to come under attack from China 
as part of the conflict over the islands.
In
 recent days, China and Japan have acted to try to ease tensions. Xi and
 Abe held their first-ever meeting in Beijing this past week, a 
discussion the Japanese leader called a "first step" toward reconciling.
Australia,
 the G-20 host, has played an important role in Obama's efforts to 
bolster the U.S. military presence in the region in order to be a 
counterweight to China. During a trip to Australia in 2011, Obama 
announced a plan to rotate 2,500 U.S. Marines through a military base in
 the northern city of Darwin.
 
 
        