September 24, 2008 8:26 PM

U.S. efforts to curb nuclear weapons falter in Iran, N. Korea

The deepest freeze in U.S.-Russia relations since the Cold War has brought diplomatic efforts to halt Iran's nuclear ambitions to a halt just as Western governments and U.N. inspectors are warning that Tehran could be gaining the ability to build a nuclear weapon. Russia this week pulled out of a six-nation meeting scheduled for Thursday to discuss further sanctions against Iran.

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