Japan's Ground Self-Defence Force (JGSDF) — its army — will send 40 personnel to participate in Talisman Sabre, a two-yearly drill that begins on July 7 which will involve around 27,000 servicemen, a spokesman told AFP.

"We will participate in joint exercises with the US Marines rather than operating directly with the Australian military," he said.

But the participation was seen as part of efforts to strengthen defence ties between Japan and Australia, he added.

The drill, which takes place in Australia, is intended to "improve tactical expertise in amphibian operations and to strengthen Japan-US interoperability", an army statement said.

News of Japan's participation came as tensions remain high in the region, with increasing criticism of China's behaviour in the South China Sea, where it has accelerated building artificial islands in disputed waters.

In July last year the United States, India and Japan held week-long war games in the Pacific.