Article: New cracks in nuclear containment; As North Korea, South Korea, and Iran test limits and raise risks of an arms race, the global challenge to nonproliferation grows.(USA)

Byline: Peter Grier and Faye Bowers Staff writers of The Christian Science Monitor

WASHINGTON -- North Korea might test a nuclear weapon in the near future, though it apparently didn't explode one over the weekend. Iran is forging ahead with nuclear activities despite objections from much of the rest of the world. South Korea, it turns out, produced some fissile material a few years ago. The Seoul government didn't know what was going on - or so it says.

The global effort to curb nuclear proliferation may now be facing some of its most daunting challenges in years. Taken separately, the news items above are bad enough. But some experts worry that, added ...

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