South Korea, US work on joint strategy over North nuclear threat

Senior South Korean and U.S. defense officials met in Seoul to discuss new guidelines for coordinating their response to potential nuclear threats from North Korea. The guidelines focus on maintaining a "credible and effective" nuclear deterrence policy and posture. The meeting follows last year's summit where the U.S. promised to share more nuclear planning information with South Korea. The next meeting will be held in Washington later this year.