US  Vice President Mike Pence has said  North Korea is yet to take concrete steps to dismantle its nuclear weapons that threaten America and other countries in the region.  He also said that Russia seeks to overturn the international order that the US has upheld for more than half a century.   <br />'' <br />''Mr Pence was addressing the global chief of mission conference yesterday. His statement gains significance as the White House is preparing for another summit between President Donald Trump and the North Korean leader Kim Jong-un. <br />''<br />''The two leaders held a historic meeting on June 12 last year in Singapore where they issued a vague goal for the complete denuclearisation of the Korean Peninsula without describing when and how it would occur.<br />''<br />''<span style="color: #222222;"> </span><br />