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.

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?

John Park of the U.S. Institute of Peace suggests a private sector solution could end a stalemate over $25 million in North Korean funds threatening to kill a denuclearization deal.

Charles D. Ferguson, fellow for science and technology at the Council on Foreign Relations, says Iran “is much further along in its nuclear program than many experts were predicting.”

Iran now says it will attend a conference on Iraqi security and has shown a willingness to negotiate on its nuclear program amid growing pressure.

Gary Samore, a North Korea expert, says he believes Pyongyang will close down its Yongbyon reactor. But he says it will be difficult to proceed further because of North Korea’s continuing desire to be rewarded with light-water nuclear reactors.

David Albright, a well-known expert on Iranian and North Korean nuclear programs, says the North Korean insistence on getting their benefits before carrying out their obligations can only slow down the implementation of the deal for ending North Korea’s nuclear program.

Juan Cole, an expert on Iran, says Iranian Supreme Leader Ayatollah Ali Khamenei used the capture of British military personnel “to whip up Iranian nationalistic sentiments” to garner support for his regime.

George Perkovich, a leading expert on Iran and nuclear nonproliferation issues, says there is no question that Iran has not complied yet with the IAEA investigation into its nuclear activities despite its claims to the contrary.

Six-Party Talks stall, despite a U.S. policy shift involving the release of frozen North Korean funds from a bank in Macao.

A second round of UN sanctions is expected against Iran, including a possible arms embargo. Yet experts disagree whether more sanctions will make Tehran buckle.

Two nonproliferation experts evaluate the recent deal with North Korea's nuclear program.

Don Oberdorfer, a leading Korea expert, says “important progress” has been made toward normalization of U.S.-North Korea relations.

Efforts to normalize U.S.-North Korea relations are underway as questions surround 2002 intelligence on Pyongyang’s uranium enrichment program.

An IAEA report affirms Iran is defying another nuclear deadline set by the Security Council but it is unclear what punitive measures will follow.

This report from the Institute for Science and International Security examines North Korea's plutonium production activity and provides an assessment of its current stocks of separated plutonium.