"In truth, nuclear weapons are clearly only leading to greater isolation, ignominy and deprivation", Tillerson said at the U.N. Security Council.
"It is his first and foremost responsibility, but we're not in this alone", said Tillerson. Tillerson says it would be President Donald Trump's decision, but he adds that all military options remain on the table.
The state news agency KCNA, quoting the foreign ministry statement, said the economic restrictions - which USA officials estimate could deny the impoverished state more than $2 billion in revenue - were an "act of hostility to physically exterminate the people of" North Korea.
He also said that he's been in contact with both Russian Federation and China on the issue of North Korea.
In an escalation of the war of words between the United States and North Korea, Trump sent a pre-dawn tweet Friday saying, "Kim Jong Un of North Korea, who is obviously a madman who doesn't mind starving or killing his people, will be tested like never before!".
Kim responded in a statement Thursday saying Trump will "pay dearly" for his address to the United Nations and that North Korea is considering the strongest possible response to what he called the USA president's provocation. Hours later, North Korea's foreign minister reportedly said his country may test a hydrogen bomb in the Pacific Ocean.
North Korean Foreign Minister Ri Yong-ho, in NY for the U.N. General Assembly, said Thursday evening that his country could detonate a hydrogen bomb over the Pacific Ocean, but also told reporters, "We have no idea about what actions could be taken, as it will be ordered by leader Kim Jong Un".
US Ambassador to the United Nations Nikki Haley was commenting on the issue a few days earlier, also speaking about the responsible path of diplomacy on North Korea, despite President Donald Trump's warning that Washington was ready to destroy the country and adopting sanctions.
Hours later, Kim branded Trump as "deranged".