In an opinion piece in the New York Times, Secretary of State Rex Tillerson said yesterday some 90 per cent of Pyongyang's export earnings had been cut off by a series of international sanctions after the Trump administration "abandoned the failed policy of strategic patience".
Tensions have escalated dramatically on the Korean peninsula this year after the isolated but nuclear-armed regime staged a series of atomic and intercontinental ballistic missile (ICBM) tests - and as US President Donald Trump and North Korean leader Kim Jong-Un traded personal insults.
Pyongyang has hit out at those sanctions, calling the latest round "an act of war", and has vowed to never give up its nuclear programme.
In his piece Tillerson said "a door to dialogue remains open" for Pyongyang but warned "until denuclearisation occurs, the pressure will continue".
At the same time he called on China - Pyongyang's only major ally - to "do more" to pressure North Korea.
Addressing relations with Moscow, Tillerson said the Trump administration had "no illusions about the regime we are dealing with" and that they were "on guard against Russian aggression".
But he added that Washington needed to "recongise the need to work with Russia where mutual interests intersect" citing Syria civil war where the two countries have backed opposing sides but pushed for peace talks.
On Iran he struck a less conciliatory tone.
"The flawed nuclear deal is no longer the focal point of our policy toward Iran," he warned. "We are now confronting the totality of Iranian threats."
Critics say Tillerson's first year in office has seen scores of key diplomatic posts go unfilled, embassies hampered by cuts and many veteran staff leave the foreign service altogether.
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