The U.S. special representative for North Korea says Washington won’t accept a year-end deadline set by Pyongyang to make concessions in stalled nuclear talks.

Stephen Biegun made the comments on Monday, two days after North Korea said it conducted a second significant test at its long-range rocket launch site.

Experts say the North Korean tests are aimed at placing more pressure on the U.S.

Biegun says the U.S. has no deadline and that a provocation by North Korea won't be helpful in achieving peace on the Korean Peninsula.

He urged North Korea to reach out for talks.

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