Rishi Sunak has announced a collaboration between the UK, Italy and Japan to develop a new fighter jet that uses artificial intelligence.
The prime minister says the joint venture aims to create thousands of UK jobs and strengthen security ties.
The nations will develop a next generation fighter - due to enter service in the mid-2030s - that will eventually replace the Typhoon jet.
It is hoped the new Tempest jet will carry the latest weapons.
Mr Sunak said the partnership would "keep the country safe from the new threats that we face" as he visited RAF Coningsby in Lincolnshire on Friday.
He said: "We're one of the few countries in the world that has the capability to build technologically advanced fighter aircraft."
Work on developing it is already under way - with the aim to create a combat aircraft that will provide speed stealth, use advanced sensors and even artificial intelligence to assist the human pilot when they are overwhelmed, or under extreme stress.
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