LONDON, Jan 11 (AFP) - The British and Japanese prime ministers signed what Downing Street called a "hugely significant" new defence deal allowing UK troops to deploy in Japan as the pair met in London on Wednesday (Jan 11).

Rishi Sunak and Fumio Kishida signed the agreement at the Tower of London, with the UK leader telling his guest "the relationship between our two countries is stronger than ever, not just across trade and security but also our values".

The agreement is the latest sign of the UK's growing interest in the Asia-Pacific region, and Tokyo's efforts to strengthen its alliances to face the challenges posed by China.

The deal creates a legal basis for the deployment of British and Japanese troops on each other's territory for training and other operations.

Sunak's office called it "the most significant defence agreement between the two countries in more than a century".

"This Reciprocal Access Agreement is hugely significant for both our nations - it cements our commitment to the Indo-Pacific and underlines our joint efforts to bolster economic security," he said.

Negotiations on the deal began in 2021.

Japan signed a similar accord with Australia last January, and Tokyo has recently overhauled its defence and security policy to address growing pressure from China.

Euan Graham, a senior fellow at the International Institute for Strategic Studies, described the deal as "quite a significant step up for both countries in terms of their bilateral defence relationship".

British ships and aircraft can visit Japan and vice-versa, but the process is "diplomatically complicated" and requires foreign ministry clearance each time.

The new agreement will create a "standing framework" instead.

That will make it easier to "bring a destroyer to visit Yokosuka, or to bring in an army group, or to bring in some Royal Marines who want to train with the Japanese amphibious forces," Graham told AFP.