North Korean leader Kim Jong Un has vowed to bolster his nuclear weapons program in response to the U.S.’s enhanced security partnership with South Korea and Japan. Last year, the U.S. expanded bilateral military exercises with South Korean and trilateral training with South Korea and Japan.

"I never expected to meet you at this place," said Kim to Trump. The US president had organised the last-minute rendezvous on Twitter, as it was then known, just 30 hours earlier when he suggested meeting Chairman Kim at the DMZ "just to shake his hand and say Hello (?