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Security Council members voted to impose tough new financial and trade restrictions on Pyongyang in hopes of halting its nuclear program.
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Seoul says it will strike back if North Korea makes good on a threat to attack U.S. and South Korean forces.
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Representatives for Iran and the world powers say they are encouraged, but there's still a long way to go before any agreement is possible.
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Two days of talks on Iran's nuclear program ended in Kazakhstan Tuesday. Although there were no dramatic breakthroughs, officials reported there was enough movement to return to the table in April to try to resolve concerns and questions about the program.
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A new round of talks on Iran's nuclear program is under way. But international sanctions haven't led to the type of concessions the West hoped for, and prospects for a breakthrough are limited.
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Talks start Tuesday in Kazakhstan. The U.S. and its allies want Iran to give up any ambitions for nuclear weapons. Iran says its nuclear program is for peaceful purposes.
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North Korea's latest nuclear weapons test is much more powerful than the previous two, according to estimates made by instruments that measure seismic waves from the blast. But it's hard to verify North Korea's claim that the test was of a miniaturized nuclear weapon.
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A year ago, there was speculation that Kim Jong Un might be different from his father and grandfather. North Korea's nuclear muscle-flexing has all but silenced that discussion.
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Analysts also say North Korea's claim that the device was smaller and lighter than ones it previously tested might be a sign it has moved closer to being able to fit a weapon on to a missile. Leaders around the world are condemning North Korea's actions.
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Obtaining the materials to make weapons-grade uranium or separated plutonium is harder than making a nuclear weapon, experts say. That's why the U.S. is engaged in a global effort to try to keep the specialized products out of hands it deems dangerous, like Iran.