US President Donald Trump said Thursday he has given approval for ally South Korea to build a nuclear powered submarine, a day after the two countries said they have reached a broad trade deal.

Trump met South Korean counterpart Lee Jae Myung on Wednesday in the southern town of Gyeongju, where the US leader arrived for a summit of the Asia-Pacific Economic Cooperation (APEC) forum.

On Wednesday, Seoul's presidential aide said the two counries had reached a broad deal covering investment and shipbuilding, while Trump said the agreement was "pretty much" finalised.

"I have given them approval to build a Nuclear Powered Submarine, rather than the old fashioned, and far less nimble, diesel powered Submarines that they have now," Trump said on Truth Social Thursday.

In a separate post, he

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