He also said, without elaboration, that the Trump administration has military options against North Korea that would not put Seoul at risk. He would not say whether he was referring to overt combat action, a cyberattack or something more covert.
"I will not go into details," he said.
Mattis also confirmed that he and his South Korean counterpart had recently discussed the possibility of putting US nuclear weapons back into South Korea, an option that has been raised publicly by some South Korean politicians.
"We discussed the option, but that's all ... I want to say," he said.
Mattis discussed several aspects of the North Korea crisis in an impromptu exchange with reporters at the Pentagon, including the effect of international economic sanctions and diplomatic pressure on North Korea.
He argued that the pressure is working, and gave as an example Mexico's decision to expel the North Korean ambassador in Mexico City.
He was asked why the US, which has spent tens of billions of dollars on missile defence programs in recent decades, has not tried to intercept North Korea's rockets as they demonstrate an increasingly sophisticated missile capability. "No. 1, those missiles are not directly threatening any of us," he said.
On September 3, North Korea conducted an underground nuclear test that was by far its most powerful to date.
Last week, North Korea launched an intermediate-range ballistic missile that travelled 3,700 kilometres and passed over the Japanese island of Hokkaido before landing in the northern Pacific. It was the country's longest-ever test flight of a ballistic missile.
In his remarks today, Mattis made clear that the US and Japan are prepared for future missile threats.
The North Koreans "are intentionally doing provocations that seem to press against the envelope for just how far can they push without going over some kind of a line, in their minds, that would make them vulnerable," he said. "So they aim for the middle of the Pacific Ocean."
"The bottom line is that the missiles, were they to be a threat" either to the US or Japan, "that would elicit a different response from us.
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