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Analyzes the motivation behind U.S. President George W. Bush's recent shift in dealing with Iran's nuclear program. Bush's goal of rewriting the main treaty governing the spread of nuclear technology, without actually renegotiating it; How Bush has convinced European allies that Iran must give up its right to enrich uranium to produce electric power; Suggestion that Bush's argument amounts to a reinterpretation of the Nuclear Nonproliferation Treaty; Background on the treaty, whose intellectual roots date back to the Eisenhower administration; Administration's effort to close loopholes in the treaty letting Iran and others enrich uranium; Why Bush has not called for renegotiating the treaty; Analysis of the treaty; Agreement between Bush and the director general of the IAEA, Dr. Mohamed ElBaradei, that established nuclear nations should supply fuel to countries that need it.

Focuses on the U.S. and the issue of nuclear nonproliferation. How lines have blurred as nuclear technology has spread; Suggestion that the President George W. Bush administration has sent conflicting signals about what it will do if diplomacy fails to disarm Iran and North Korea; Reference to Israel, India and Pakistan and the Nuclear Nonproliferation Treaty; Comments of analysts; Question of how far the Europeans are willing to let the Iranians go in developing a civilian nuclear capability that could be converted to military use; Outlook.

Reports that, roughly a year after Libya disarmed and Pakistan put Dr. Abdul Qadeer Khan under house arrest, the intelligence agencies and the International Atomic Energy Agency (IAEA) are still far from fully understanding Khan's atomic black market. Background on the rogue nuclear network led by Khan, chief architect of Pakistan's bomb; How the inquiry into Khan's global enterprise has been hampered by discord between the U.S. President George W. Bush administration and the IAEA; Khan's role as mastermind of the largest illicit nuclear proliferation network in history; Concerns; Outlook. INSET: A Nuclear Network Partly Revealed.

Discusses how the South Korean government admitted to the International Atomic Energy Agency that a group of the country's scientists secretly produced a small amount of near-weapons grade uranium. Suspicions that South Korea may have attempted a secret program in order to compete with the nuclear weapons arsenal of North Korea; Details on how a group of rogue scientists produced highly enriched uranium in 2000 without the knowledge of the government; Ways the country violated the Nuclear Nonproliferation Treaty; How an investigation by energy agency inspectors triggered the South Korean disclosure.

Discusses that the revelations about the international nuclear trading of the Pakistani scientist Abdul Qadeer Khan have rekindled a debate inside the American intelligence community over the possibility that Pakistan conducted a secret nuclear weapons test partnership with North Korea. Confession made by the scientist that he spread nuclear skills and equipment to North Korea, Libya and Iran, over more than a decade; Report being prepared by the Central Intelligence Agency on what North Korea may have gained from the scientist's nuclear dealings.

Discusses proposals for dealing with what experts call a dangerous new phase of nuclear proliferation. Solution that was proposed by a small political and technical elite more than 60 years ago; Debate over internationalism versus unilateralism; Confession of Pakistani scientist, Dr. Abdul Qadeer Khan; Proposal of U.S. President George W. Bush to shut down the black market; How Mohamed ElBaradei, director of the International Atomic Energy Agency, is urging multinational controls on making materials that can be used for nuclear arms; Views of analysts; Efforts at unilateral and global controls in the past; How the current crisis marks a dangerous escalation; Outlook.