World leaders moving to discussions of nuclear threats posed by Iran and North Korea

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World summit turning attention to nuclear threats

HUNTSVILLE, Ontario — After failing to resolve their differences on economic strategy, world leaders are turning their attention to grappling with some of the globe’s toughest foreign policy problems.

President Barack Obama and other leaders of the Group of Eight countries meeting in Canada were to open their second day of talks Saturday focused on nuclear standoffs with Iran and North Korea.

On Iran, the U.S. and European nations will push other major powers to join them in imposing tough new sanctions on Tehran over its suspect nuclear program. But China and Russia have balked at new unilateral steps against Iran.