SYDNEY - The United States and Australia kicked off a massive joint biennial military exercise on Sunday, with Japan taking part for the first time as tensions with China over territorial rows loom over the drills.
Australian Prime Minister Tony Abbott (C) meets US sailors on board the USS Blue Ridge in Sydney Harbour on July 3, 2015, ahead of the joint Australia-US-Japan military exercises, known as the Talisman Sabre Operation, which start on July 5
The two-week "Talisman Sabre" exercise in the Northern Territory and Queensland state involves 30,000 personnel from the US and Australia practising operations at sea, in the air and on land.
Some 40 personnel from Japan's army -- the Ground Self-Defense Force (JGSDF) -- will join the American contingent, while more than 500 troops from New Zealand are also involved in the exercise, which concludes on July 21.
"It is a very, very important alliance," Prime Minister Tony Abbott said Friday in Sydney on board the USS Blue Ridge, which is taking part in the exercise, referring to Australia-US ties.
"It's a very important relationship and right now we are facing quite significant challenges in many parts of the world but particularly in the Middle East."
The war games, being held for the sixth time, come as China flexes its strategic and economic muscle in the region.
Beijing has been building artificial islands and facilities in disputed waters in the South China Sea, and has a separate territorial dispute with Japan over the Tokyo-controlled Senkaku islands -- which it calls the Diaoyus -- in the East China Sea.
"There's subtle message going out that at every level -- from hardware to technical and strategic expertise and cooperation -- the main American allies and America are working very closely together largely to account for China," John Lee, a China specialist at the University of Sydney, told AFP.
Beijing rejected US criticism of its reclamation works in the South China Sea during the annual Shangri-La Dialogue meeting in May, saying it was just exercising its sovereignty.
The US has been pursuing a foreign policy "pivot" towards Asia, which has rattled China, and is rotating Marines through northern Australia -- a move announced by President Barack Obama in 2011.
While Beijing would not be pleased with Japan's involvement in the drills, it would also not be surprised, experts said.
Australia has stepped up its relationship with Japan in recent years and last July Abbott described his counterpart Shinzo Abe as "a very, very close friend" during a state visit to Canberra.
"It's a continuation of a deepening security relationship between Australia and Japan," Andrew Davies, a senior defence capability analyst at the Australian Strategic Policy Institute, told AFP of Japan's inclusion in the exercise.