<sod >ÃÂÃÂ  He warned that North Korea continues to strengthen its nuclear weapons programme with weapons that "threaten everywhere in the world." The US had recently put North Korea back on the list of nations that sponsor terrorism, with Mr Tillerson said at the time that theÃÂÃÂ move was "very symbolic.< eod>< sod > ÃÂÃÂ  He warned that North Korea continues to strengthen its nuclear weapons programme with weapons that "threaten everywhere in the world." Mr MattisÃÂÃÂ added on Thursday that US diplomats are in a strong position as "we do have military options" and that those diplomats would be "unrelenting" in their work through the UN.< eod>