Coat of Arms of North Korea From The Daily Yomiuri by Aya Igarashi / Yomiuri Shimbun Correspondent - Yuriko Koike, national security adviser to the prime minister, and U.S. national security adviser Stephen Hadley agreed Tuesday their two countries will strengthen their cooperation in handling North Korea’s vow to conduct a nuclear experiment.

During their meeting at the White House, Koike and Hadley decided that Japan and the United States should aim for the quick adoption of a statement by the U.N. Security Council president asking for Pyongyang to exercise restraint.

At the meeting, the two expressed concern about North Korea’s announcement that it will conduct a nuclear test, sharing the opinion they will not tolerate Pyongyang carrying out a nuclear test.

They confirmed that both countries will share information about movements in North Korea that indicate signs of a nuclear experiment.

After the meeting, Koike said the United Nations should prevent Pyongyang from conducting the experiment by issuing a Security Council presidential statement or taking other strong action.

Koike also met with U.S. Undersecretary of State for Political Affairs Nicholas Burns later in the day at the State Department. They agreed that China would play an important role in preventing a nuclear test by Pyongyang.

Regarding the North Korean statement, China has insisted the issue should be resolved through the six-nation talks rather than the United Nations.