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North Korea has been a big headache for the United States, with the new leader there saying almost daily that his country is ready to go to war.

North Korea said Tuesday it will restart its long-shuttered plutonium reactor and increase production of nuclear weapons material, in what outsiders see as its latest attempt to extract U.S. concessions by raising fears of war.

Russia is urging the U.S. and North Korea to end an escalating cycle of dangerous provocations after Pyongyang put its missile forces on high alert and American stealth bombers flew practice bomb runs over the Korean Peninsula.

The Obama administration will add 14 interceptors to a West Coast-based missile defense system, reflecting concern about North Korea's focus on developing nuclear weapons and its advances in long-range missile technology, officials said Friday.

South Korea upped the ante on Wednesday after Pyongyang threatened to scrap the armistice that ended a brutal war between the rival neighbors in 1953, promising retaliation for any North Korean attack.

Defying U.N. warnings, North Korea on Tuesday conducted its third nuclear test in the remote, snowy northeast, taking a crucial step toward its goal of building a bomb small enough to be fitted on a missile capable of striking the United States.

North Korea says it has tested a "miniaturized" nuclear device in defiance of U.N. orders to stop building atomic weapons.

Responding to tightened sanctions and a new United Nations Security Council resolution condemning their December rocket launch, North Korea has threatened a new nuclear test, explicitly warning that the North Korean weapons program will target the United States.

North Korea's top governing body warned Thursday that the regime will conduct its third nuclear test in defiance of U.N. punishment, and made clear that its long-range rockets are designed to carry not only satellites but also warheads aimed at striking the United States.

Mexico City has been awarded the 2013 Sustainable Transport Award. The accolade is a major accomplishment for a city that has historically struggled with transportation for its 8.8 million citizens.