The Trump administration said on Wednesday it aimed to push North Korea into dismantling its nuclear and missile programs through tougher international sanctions and diplomatic pressure, and remained open to negotiations to bring that about.
The US stance, which appeared to signal a willingness to exhaust non-military avenues despite repeated warnings that "all options are on the table," came in a statement following an unusual White House-hosted briefing for the entire US Senate followed by a briefing to the House of Representatives.
The statement from Secretary of State Rex Tillerson, Defence Secretary Jim Mattis and Director of National Intelligence Dan Coats described North Korea as "an urgent national security threat and top foreign policy priority."
North Korea's growing nuclear and missile threat is perhaps the most serious security challenge confronting President Donald Trump, who has vowed to prevent North Korea from being able to hit the United States with a nuclear missile - a capability experts say Pyongyang could have some time after 2020.
"The President’s approach aims to pressure North Korea into dismantling its nuclear, ballistic missile, and proliferation programs by tightening economic sanctions and pursuing diplomatic measures with our allies and regional partners," the statement said.
"The United States seeks stability and the peaceful denuclearisation of the Korean peninsula. We remain open to negotiations towards that goal. However, we remain prepared to defend ourselves and our allies."
US lawmakers have been seeking a clear White House strategy following repeated North Korean missile tests and fears it could conduct a sixth nuclear bomb test. But some lawmakers on both sides went away dissatisfied.
While the administration has said military strikes remain an option, officials have stressed tougher sanctions as the key strategy given the risks of massive North Korean retaliation - essentially representing a continuation of the policy of former President Barack Obama's administration, which failed to slow Pyongyang's weapons programs.
Democratic Senator Christopher Coons told reporters after the White House briefing that military options were discussed.
"It was a sobering briefing in which it was clear just how much thought and planning was going into preparing military options, if called for, and a diplomatic strategy that strikes me as clear-eyed and well proportioned," Coons said.
Tillerson will chair a ministerial meeting of the UN Security Council on Friday that is expected to discuss tougher sanctions, which US officials say could include an oil embargo, banning North Korea's airline, intercepting cargo ships and punishing Chinese and other foreign banks doing business with Pyongyang.
US State Department spokesman Mark Toner said another means of diplomatic pressure would be for nations to close North Korean missions and to ostracise North Korea in international organisations.
China objects to North Korea's weapons development and has called for a return to international negotiations, but US officials have said Washington sees no value in talks until Pyongyang shows it is serious about denuclearisation.


