Their pledge comes just two days after US National Intelligence Director James Clapper publicly called that goal a "lost cause." He said the best hope is capping its capability instead.
The deputy foreign ministers who held talks in Tokyo made clear that North Korea now poses a new level of threat and requires broader international pressure and tougher sanctions.
US Deputy Secretary of State Antony Blinken, after meeting with his Japanese and South Korean counterparts, said their policy has not changed.
Getting North Korea to give up its nuclear weapons program has long been a headache in multilateral diplomacy with Pyongyang.
Japanese Vice Foreign Minister Shinsuke Sugiyama, who hosted today's talks, cited North Korea's recent tests showing the country's missile and nuclear capability had entered a new level of threat. "We need to respond differently than in the past," he said.
Meanwhile, South Korea said today it plans to restart talks with Japan on a military intelligence sharing agreement to better cope with threats from North Korea.
Information from Japan's network of satellites and other intelligence-gathering systems would be critical in monitoring and preparing against North Korea's fast developing nuclear weapons and missile programs, South Korea's Defense Ministry said.
The United States, South Korea and Japan signed a joint intelligence-sharing pact in 2014, but under the framework Seoul and Tokyo only share intelligence about North Korea's nuclear and missile programs via Washington. A bilateral agreement between South Korea and Japan would enable a quicker transfer of information between the countries in urgent situations.
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