US President Donald Trump has discussed a range of options with his national security team to respond to North Korea's recent missile and nuclear tests. This was informed by Mr. Trump's office. According to a statement, the briefing by his defense secretary James Mattis and top military officer General Joseph Dunford focused on a range of options to respond to any form of North Korean aggression or, if necessary, to prevent North Korea from threatening the United States and its allies with nuclear weapons.<br/><br/>The US administration has also been at the forefront of a drive to impose a series of sanctions against North Korea in response to its sixth nuclear test — the largest yet ' and the launch of two missiles over Japan.<br/><br/>