<span style="color: #222222;">US President Donald Trump has voiced confidence that North Korea's Kim Jong Un would not break his promise, after South Korea said Pyongyang had launched several unidentified projectiles into the sea.</span><br />'' <br />'' <span style="color: #222222;">In a tweet, Trump said that he believes that Kim Jong Un fully realizes the great economic potential of North Korea and will do nothing to interfere or end it. </span><br />