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The planned missile launch appears part of a long pattern of steps forward but then backward in U.S. dealings with North Korea and plays into Republican claims that Obama is being played the fool.

The summit will bring together nuclear-armed nations, plus those with civilian nuclear energy plants and several seeking to build them. Several non-nuclear nations and international organizations, including the U.N. and the International Atomic Energy Agency, are attending.

Countries known or suspected to have nuclear weapons are the U.S., Russia, Britain, France, China, Israel, India, Pakistan and North Korea.

Scores of countries still have research reactors fueled by weapons-usable uranium, and medical devices that use radioactive materials that could be fashioned into a “dirty bomb” are scattered all over the world.


Feller is AP’s White House correspondent; Gearan is an AP national security writer.