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Yesterday Trump pledged to ramp up defences against Pyongyang as he met China’s president Xi Jinping for crunch talks in Florida.
Trump's warning comes as a massive joint naval exercise involving Japan, South Korea and the US was being held this week aimed at countering the threat from North Korean submarines - ramping up the tense situation in the region.
This training was branded "reckless" by North Korea's foreign ministry who said it was driving the Korean peninsula to the "brink of war".