The American leader is to meet with Japanese Prime Minister Shinzo Abe and Australia's Tony Abbott during his time in Brisbane, a senior administration official told AFP.
"The trilat is a new and unique way to leverage the capabilities of key Asian partners to improve our security posture in the region, for example on maritime security and missile defence, and to partner on global issues, including ISIL, Ukraine, Ebola," the official said.
The prospect of a stronger tripartite alliance will stoke fears in Beijing that Japan, the United States and Australia are ganging up to limit China's increasingly assertive expansion in the region.
China claims rights over Tokyo-administered islands in the
Also Read
East China Sea, with several other countries in the region also at loggerheads with Beijing over territorial disputes.
Beijing has repeatedly warned of what it says is the danger of Japan "remilitarising" under Abe, and regularly lambasts Tokyo for its apparent lack of repentance for past misdeeds during WWII.
"As the United States is the most important ally for Japan
and Australia, I am determined to expand trilateral cooperation between the three countries, to realise a peaceful, secure and prosperous future for the Asia-Pacific region," he wrote.
"I also hope that our countries will work closely together
to support the resolution of global issues."
Japanese officials had no comment on the three-way meeting.
Abe, who in July became the first Japanese leader to address the Australian parliament, described Canberra as Tokyo's "best friend".
US Secretary of State John Kerry said at the time that it was not a move aimed at curbing Beijing, insisting "we welcome the rise of China as a global partner".