Starmer noted that Japan and Britain were the leading economies in a trans-Pacific that includes fellow G7 member Canada, as well as other international trade and defence pacts.
"We set out a clear priority to build an even deeper partnership in the years to come," Starmer said as he stood beside Japan's Prime Minister Sanae Takaichi after a bilateral meeting in Tokyo.
"That includes working together to strengthen our collective security, across the Euro-Atlantic and in the Indo-Pacific."
Takaichi said they agreed to hold a meeting of British and Japanese foreign and defence ministers this year.
She said she also wanted to discuss "cooperation towards realising a free and open Indo-Pacific, the Middle East situation and Ukraine situation" at a dinner with Starmer later on Saturday.
Starmer arrived on a one-day Tokyo stop after a four-day visit in China, where he followed in the footsteps of other Western leaders looking to counter an increasingly volatile United States.
Leaders from France, Canada and Finland have all travelled to Beijing in recent weeks, recoiling from Trump's bid to seize Greenland and tariff threats against NATO allies.
Trump warned on Thursday it was "very dangerous" for its close ally Britain to be dealing with China, although Starmer brushed off those comments.
Tokyo's ties with Beijing have deteriorated since Takaichi suggested in November that Japan could intervene militarily during a potential attack on Taiwan.
China regards the self-ruled democratic island as its territory.
Starmer met Chinese President Xi Jinping and Premier Li Qiang on Thursday, with both sides highlighting the need for closer ties.
He also signed a series of agreements there, with Downing Street announcing Beijing had agreed to visa-free travel for British citizens visiting China for under 30 days.
No start date for that arrangement has been given yet.
Takaich said the two leaders agreed during discussions on economic security that a strengthening of supply chains "including important minerals is urgently needed".
There is concern that Beijing could choke off exports of the rare earths crucial for making everything from electric cars to missiles.
China, the world's leading producer of such minerals, announced new export controls in October on rare earths and associated technologies.
They have also been a major sticking point in trade negotiations between China and the United States.
Britain, Japan and Italy are also developing a new fighter jet after Tokyo relied for decades on the United States for military hardware.
Saudi-Pakistan mutual defence pact will not include Turkey: sources
Riyadh, Saudi Arabia (AFP) Jan 31, 2026 -
Turkey will not join a mutual defence pact between Saudi Arabia and Pakistan, a source close to the Saudi military told AFP on Saturday, after a Turkish official said earlier this month that they had entered talks aimed at entering the alliance.
Speculation has been rife that the three countries were intent on forming a powerful alliance amid soaring tensions in the region, following Israeli air strikes in Doha over the summer targeting Hamas officials that preceded Iran's bombing of a US air base in Qatar.
"Turkey won't join the defence pact with Pakistan," the source told AFP, dismissing reports of negotiations.
"It's a bilateral pact with Pakistan and will remain a bilateral pact".
A Gulf official also confirmed the information.
"This is a bilateral defensive relationship with Pakistan. We have common agreements with Turkey but the one with Pakistan will stay bilateral," the official said.
The defence agreement between Pakistan and Saudi Arabia, announced last year raised many questions, particularly about its possible nuclear component, given that Islamabad possesses nuclear weapons.
The Pakistan-Saudi pact was signed just months after Pakistan and India fought an intense four-day conflict in May that killed more than 70 people on both sides in missile, drone and artillery fire, the worst clashes between the nuclear-armed neighbours since 1999.
Pakistan and India, also a nuclear power, have long accused each other of backing militant forces to destabilise one another.
Saudi Arabia is believed to have played a key role in defusing the conflict.
Riyadh also maintains good relations with Delhi.
India's rapidly developing economy relies heavily on petroleum imports, with Saudi Arabia ranked as its third-largest supplier according to the Indian foreign ministry.
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