Trump announces 'heaviest ever' North Korea sanctions

Measures come as South Korea continues diplomatic push with Pyongyang

Protesters including the bereaved families of the 46 crewmen killed in the 2010 sinking of the Cheonan warship stage a rally in Seoul, South Korea, 24 February 2018, to oppose the planned visit to SouShow more

US president Donald Trump has rolled out fresh sanctions against North Korea-linked shipping assets, hailing the package as the toughest measures levied on Pyongyang.

Mr Trump used a speech to conservatives just outside Washington to step up his campaign of "maximum pressure" designed to force North Korea to roll back its weapons programmes.

"We imposed today the heaviest sanctions ever imposed on a country before," he said at the end of a lengthy campaign-style address on Friday.

In light of past US embargoes, that is likely an overstatement, but Treasury Secretary Steve Mnuchin confirmed the sanctions covered virtually all ships that North Korea is "using at this moment in time".

Speaking to reporters in Pyeongchang on Saturday on a visit to the Winter Olympics, White House spokeswoman Sarah Sanders said: "Hopefully we'll see a change on the part of the North Koreans to start to denuclearise the peninsula, that's what our focus is."

She added: "I can tell you the president won't make the mistakes the previous administration has and be soft or weak."

Mr Trump's administration is locked in a nuclear standoff with North Korea, which is trying to develop missiles that could deliver an atomic weapon to major US cities.

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The latest sanctions are designed to put the squeeze on the communist state's already precarious economy and fuel supply.

In his speech, the US president had been expected to provide details of measures that target "56 vessels, shipping companies, and trade businesses," but skipped that part of his prepared remarks.

"Frankly hopefully something positive can happen," he said instead.

During a joint press conference with Australian prime minister Malcolm Turnbull, Mr Trump said sanctions were only the first step.

"If the sanctions don't work, we'll have to go to phase two. Phase two may be a very rough thing," he said, without elaborating.

Mr Mnuchin said there were signs the punitive measures were starting to have an impact, but did not elaborate.

The North Korean military and broader economy depend heavily on imports of coal and oil from China and Russia.

China, Pyongyang's only major ally, has steadfastly rebuffed Washington's calls for a full oil embargo — fearing the chaotic collapse of the Pyongyang regime — but has accepted caps agreed at the United Nations.

The timing of the new US measures coincides with the arrival in South Korea of Mr Trump's daughter, Ivanka.

She is attending the closing ceremony of the Winter Olympics, which have taken place against the backdrop of the crisis.

The 36-year-old businesswoman, now an aide to her father, has been tasked with reaffirming US ties with South Korea, which have been strained over how to deal with the North.

She was hosted in Seoul by president Moon Jae-in, who has long advocated talks rather than confrontation with North Korea.

"Mrs Trump delivered a personal message to president Moon from president Trump about today's North Korea related sanctions announcement at a small meeting at the Blue House," the White House said.

"They also discussed the continued effort on the joint maximum pressure campaign against North Korea."

South Korean officials, who sit in a capital well within range of conventional North Korea artillery, have been spooked by Mr Trump's talk of military confrontation.

US officials worry meanwhile that North Korea is luring president Moon into talks that are designed to go nowhere.

North Korea's delegation at the closing ceremony will be headed by top general Kim Yong Chol, who is widely blamed for a series of attacks against the South including the 2010 sinking of a warship, with the loss of 46 lives.

The White House spokeswoman said Ivanka Trump would probably sit apart from the North Korean delegation at Sunday's closing ceremony.