Shinjiro Koizumi and Richard Marles met in Canberra to discuss expanding defence ties amid regional security concerns.
Australian and Japanese defence ministers side-stepped questions on Donald Trump's plan to scale back US drills with South Korea during Canberra talks focused on deepening military ties and regional security threats.
AI-generated summary
Australia and Japan are expanding defence cooperation, including warship contracts and missile testing arrangements, amid growing regional security concerns involving China and North Korea.
Australia and Japan's defence ministers have side-stepped questions about Donald Trump's pronouncement that he will scale back military exercises with South Korea — as well as the US president's overtures to North Korean dictator Kim Jong Un — while signalling they still see Pyongyang as a serious security threat.
Shinjiro Koizumi and Richard Marles sat down in Canberra today to discuss the rapidly expanding defence ties between the two countries.
Both countries are increasingly anxious about China's rapidly swelling military might, as well as the Trump administration's chaotic and unpredictable behaviour.
The US president promised on Monday that he would scale back US participation in the Ulchi Freedom Shield exercises because Seoul had not helped the US war effort in Iran, and this morning suggested that North Korean dictator Kim Jong Un had responded "positively" to the move.
The joint exercises that started yesterday are scheduled to run until later in August, with about 18,000 South Korean military personnel taking part -as well as a small contingent of 13 ADF personnel who are serving as part of United Nations Command.
South Korean President Lee Jae Myung said this morning the annual exercises are defensive and not intended to attack North Korea or raise tensions on the peninsula.
Last week, Mr Lee proposed talks to officially end the war with Pyongyang, although North Korea has routinely tested ballistic missiles and strengthened its military ties with Russia.
'Critical' cooperation
Analysts and US senators on both sides of the aisle have warned Mr Trump's move risks alienating South Korea and undercutting US credibility in Asia, while Korean media have quoted a Japanese foreign affairs official warning "we must not weaken our posture to respond to threats."
But Mr Koizumi was much more careful when asked about the announcement, simply saying that countries like North Korea and Russia were posing an increasingly severe threat to Japan's security, and that US allies needed to deepen cooperation in response.
"Our cooperation with Australia, Japan and the US is ever more important."
Mr Marles also would not be drawn on the US president's announcement, saying "obviously what the United States does is a matter for it."
But he stressed that Australia was still "very concerned" about North Korea's nuclear and missile programs, saying that South Korea was a "critically important" defence partner for Australia.
The chief executive of the Australian Institute of International Affairs and a Japan expert, Bryce Wakefield, told the ABC that both countries would be monitoring the US administration's moves very closely.
"Tokyo's response to this development won't be panic, but it reinforces Japan's concern that longstanding alliance arrangements can become bargaining chips in Trump's personal diplomacy," he said.
"We saw this in the US president's first-term approaches to North Korea, and we're now seeing it at a time when North Korea is still testing missiles."
Dr Wakefield said that Canberra would be "uneasy for much the same reason" as Japan.
"Australia puts a lot of stock in exercises and interoperability," he said.
"It will worry less about this particular drill than the signal that the US is now changing regional commitments abruptly, according to Trump's transactional approach."
One Japanese government source said the two ministers "referred" to the president's plans in their meeting but said the overwhelming focus was on the way the two countries — often labelled as "quasi-allies" — could continue to quickly build up defence ties.
Japan to test hypersonic missiles in Australia
Australia announced last year that a Japanese company had won a multi-billion-dollar contract for Australia's next generation of warships, and signed a contract for the first three frigates in Melbourne earlier this year.
The two ministers confirmed they were pressing ahead with plans to expand Japan's access to Australia's missile ranges to allow it to conduct sophisticated tests — including with hypersonic missiles.
Japan has moved to rapidly increase defence spending to respond to China's massive military build-up, including by investing in advanced equipment such as long-range missiles and hypersonic weapons.
"We have agreed to progress a better and enhanced arrangement between Australia and Japan for Japan's use of our missile ranges over the next decade across a range of missile capabilities," Mr Marles said.
Mr Koizumi said it would be only the second time Japan would have a missile test range arrangement, behind the United States.
"If the Japan Self Defence Forces are able to conduct test launches of stand-off missiles, such as hypersonic missiles in Australia, it would be a groundbreaking development," he said.
Both ministers also said the two countries were making good progress on a new high-energy laser that they were developing together called the Boobook project — named after an Australian owl.
Mr Marles said tests had been successful and it would offer "greater protection and situational awareness by using laser to optically detect incoming threats."
Mr Koizumi also met with Prime Minister Anthony Albanese in Canberra, but told journalists they did not discuss Mr Albanese's comments about the melons gifted to him by Prime Minister Sanae Takaichi — despite the political furore it provoked in Australia last week.
"Before I visited Australia, the Australian side already told the Japanese side … that [the prime minister] did not mean it that way," he said.
AI outlook — possibilities, not facts
Japan will conduct missile tests using Australian missile ranges over the next decade.
Very likely · Within months
North Korea launched approximately 10 short-range ballistic missiles into eastern waters following the scaling back of US-South Korean military drills. The move follows warnings from Pyongyang to respond to the exercises with a new level of deterrence.
Australia is upgrading northern air bases, including RAAF Base Tindal, to host advanced fighter jets and surveillance drones. The expansion, supported by US investment, aims to enhance regional deterrence and interoperability amid rising Indo-Pacific tensions.
US President Donald Trump ordered the Pentagon to scale back joint military exercises with South Korea, citing high costs, a good relationship with North Korean leader Kim Jong Un, and South Korea's refusal to help denuclearise Iran.

Australian consultancy Horizzen discovered its corporate identity was stolen by a fake website used in an alleged Chinese espionage campaign. The site was among 13 seized by the FBI following a joint Five Eyes intelligence warning.
Victoria Police is recruiting hundreds of former officers as reservists to fill administrative roles, aiming to address chronic staffing shortages and a 10 per cent jump in adult crime.
A Russian military officer was killed in a Sevastopol bomb attack, while separate Ukrainian drone strikes hit an Orsk oil refinery and a passenger train in Odesa, amid escalating hostilities and rising July civilian casualties.