US President Donald Trump and China's leader Xi Jinping opened on Thursday their first face-to-face meeting in six years, seeking a truce to end a trade war that has roiled the world economy.

The US president, who minutes before said he has ordered the Pentagon to start nuclear weapons testing on a level with China and Russia, complimented a smiling Xi as a "very tough negotiator" as they shook hands.

"We'll have a great understanding," Trump said in Busan, South Korea, predicting a "fantastic relationship for a long period of time".

Xi acknowledged that both sides did not always see eye to eye, but should strive to be "partners and friends".

"China and the US can jointly shoulder our responsibility as major countries and work together to accomplish more great and concrete things for t

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