WASHINGTON - The United States said on Thursday North Korea had demonstrated a "qualitative" improvement in its nuclear and missile capabilities after an unprecedented level of tests last year, showing the needed to sustain pressure on Pyongyang to bring it back to disarmament negotiations.
US Deputy Secretary of State Antony Blinken told a joint news conference after a meeting with his Japanese and South Korean counterparts that North Korea had conducted 24 missile tests in the past year, as well as two nuclear tests, and learned from each one.
"Even a so-called failure is progress because ... they apply what they have learned to their technology and to the next test. And in our assessment, we have a qualitative improvement in their capabilities in the past year as a result of this unprecedented level of activity," he said.
"With every passing day the threat does get more acute," Blinken said, and referred to comments by North Korea's leader, Kim Jong Un, on Sunday that his country was close to test-launching an intercontinental ballistic missile (ICBM) of a kind that could someday hit the United States.
Blinken said it was vital for the United States, Japan, South Korea and other countries to boost cooperation to defend against the threat.
"At the same time, it's absolutely vitally important that we exercise sustained comprehensive pressure on North Korea to get it to stop these programs, to come back to the negotiating table, and to engage in good faith on denuclearization," Blinken said.