Diplomacy on the Iranian nuclear dispute picks up new intensity. So do reports of a preemptive Israeli attack on Iran.

The latest declaration from North Korea has brought rewards from Washington but experts say bigger challenges lie ahead.

Washington’s disclosure of an Israeli air strike on a suspected Syrian nuclear reactor has raised questions about both Syrian and U.S. motives in the region.

Washington’s latest revisions to its stance on North Korea nuclear-disarmament talks, experts say, threatens to undermine counter-proliferation efforts.

As the Bush administration presses for greater economic pressure to curb Iran’s nuclear ambitions, Tehran is turning east for economic survival.

Washington’s November 2007 intelligence estimate of Iranian nuclear capabilities has clouded the very issue it aimed to define.

North Korea’s missed deadline on its denuclearization pact and new tough rhetoric revive concerns about the regime’s sincerity and stability.

Iran looms large behind President Bush’s visit to the Mideast, and some Israelis fear Washington’s new views of Tehran’s nuclear activities reflect diverging U.S. and Israeli interests in the region.

After a year of stern rhetoric toward Iran, the Bush administration is showing a renewed preference for diplomacy.

The conservative front-runner won South Korea’s December 19 elections. His policies could test relations with North Korea.

The U.S. intelligence report on Iran’s nuclear capabilities was greeted warmly by President Mahmoud Ahmadinejad, but could return attention to unpopular domestic policies.

New intelligence on Iran’s nuclear weapons capabilities could lighten tension between Washington and Tehran but make economic sanctions harder to coordinate.

The war of words between Washington and Tehran has given way to glimmers of diplomacy. Is a thaw on the horizon?

Following a turbulent week of rhetoric over Iran, the UN Security Council agreed to delay action on further sanctions until November.

A mysterious Israeli air raid in Syria has led to speculation that North Korea is outfitting Damascus with nuclear material.

The annual flurry of UN summitry in New York is likely to be upstaged by a U.S.-Iran showdown over Tehran’s nuclear ambitions.

North Korea misses a critical New Year's deadline to reveal data on its nuclear weapons arsenal, imperiling the latest "breakthrough'" with Washington.

The U.S. signals new efforts to pressure Iran just as it seeks to expand ties with resource-rich states in the Shanghai Cooperation Organization.

The Bush administration wants to replace aging strategic nuclear warheads with a new, more reliable generation. Others see more pressing priorities for U.S. defense dollars.

UN inspectors confirmed the shutdown of North Korea’s main nuclear reactor. Does this represent genuine progress or just another feint by the North Korean regime?