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Any shift away from no-first use is likely to be viewed by the United States and its allies—rightly or wrongly—as provocative.

U.S. radar sites proposed for East Asia—and ostensibly directed at North Korea—underscore the need for a constructive China-U.S. dialogue on conventional military issues.

It is important that Washington and Moscow take steps toward compromising on ballistic missile defense cooperation now as a foundation for effective engagement with Beijing in the future.

The UN Security Council report published last week documents North Korea's efforts in setting up a large-scale uranium enrichment plant after sanctions were first imposed five years ago.