Secretary of State Rex Tillerson said the United States was looking at ways to pressure North Korea over its nuclear program as North Korean state media warned the Americans of a "super-mighty preemptive strike" and said don't "mess with us."
U.S. President Donald Trump has taken a hard line with North Korean leader Kim Jong Un, who has rebuffed admonitions from sole major ally China and proceeded with nuclear and missile programs in defiance of U.N. Security Council sanctions.
Reclusive North Korea regularly threatens to destroy Japan, South
"We're reviewing all the status of North Korea, both in terms of state sponsorship of terrorism as well as the other ways in which we can bring pressure on the regime in Pyongyang to re-engage with us, but re-engage with us on a different footing than past talks have been held," Tillerson told reporters in Washington on Wednesday.
U.S. Vice President Mike Pence, on a tour of Asian allies, has said repeatedly the "era of strategic patience" with North Korea is over.
U.S. House of Representatives Speaker Paul Ryan, on a visit to London, said the military option must be part of the pressure brought to bear.
"Allowing this dictator to have that kind of power is not something that civilized nations can allow to happen," he said in reference to Kim. Ryan said he was encouraged by the results of efforts to work with China to reduce tensions, but that it was unacceptable North Korea might be able to strike allies with nuclear weapons.