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Matthew Bunn

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After testing what North Korea claims was a hydrogen bomb, the U.N. Security Council called an emergency meeting to condemn the test, which violates U.N. resolutions.

Nuclear nervousness

North Korea probably didn’t detonate an H-bomb, analysts say, but isolated nation’s program is gaining sophistication

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Chief Washington correspondent for The New York Times David Sanger (from left) moderated a panel on Iran that featured Harvard's R. Nicholas Burns and Matthew Bunn, along with William H. Tobey, a former deputy administrator for defense nuclear nonproliferation at the National Nuclear Security Administration.

Straight dealing

Though Iran nuclear agreement has flaws, U.S. focus now should be on enforcement, Kennedy School panel says

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President Hassan Rouhani addressed Iranians in a televised speech after a nuclear agreement was announced today in Vienna. President Barack Obama called the deal the best available opportunity to prevent Iran from developing a nuclear weapon and possibly spurring a nuclear arms race in the Middle East.

Iran steps back

Stringent if imperfect pact to stem Iran’s nuclear efforts means taking ‘yes for an answer,’ Harvard analyst says

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