Loose nukes

The good news is that most of the cases date to the early and mid-'90s, before Russia stabilized and a US effort to help guard its material took off.

The bad news is that there may be more significant cases the world doesn't know about. Most of the confirmed incidents took place in Europe or what used to be the western USSR. Yet a glance at a map shows that southern Russia, and the former republics of Uzbekistan, Tajikistan, etc., are the logical place for a Middle Eastern group such as Al Qaeda to go nuke shopping.

The US has been involved in cooperative programs with Russia to control its loose nuclear weapons and material for years. Since 1991, US money has paid for the deactivation of more than 5,000 Russian nuclear warheads. It has provided security equipment for dozens of facilities, helped construct a secure storage facility for fissile material, and paid for science and technology centers intended to provide ex-weapons scientists the means to work on civilian research.

"These programs have made tremendous progress," notes Jon Wolfsthal, an associate

But it is Russia and the former republics of the Soviet Union that are the "Home Depot" of fissile material, in the words of one expert. The collapse of the Soviet Union threw its nuclear programs into a chaos from which they have yet to completely recover.

With the fall of the Berlin Wall, the closed cities where the USSR's nuclear weapons were produced changed from islands of prosperity to sinkholes of poverty. The human misery this created - especially in the early years - led some scientists to attempt desperate actions. In 1992, a large group of ballistic-missile experts from the closed city of Miass tried to reach North Korea, apparently to work in Pyongyang's intercontinental-ballistic-missile projects. Authorities caught them as they sat in a plane at Moscow's Sheremetievo-2 airport, waiting to take off.

Russian authorities insist that their estimated 30,000 actual nuclear warheads have remained under adequate control at all times. But the same cannot be said for its military and civilian fissile material.

Over decades, the Soviet Union produced enough highly enriched uranium (HEU) and plutonium to produce some 70,000 nuclear weapons. This was scattered at perhaps 100 sites throughout the territory of the former USSR. In the early '90s, some research sites were protected by nothing but padlocks and weeds. Dedicated scientists at times had to improvise defenses. When civil war broke out in the former republic of Georgia in 1992, scientists at one institute in Tbilisi took turns guarding 10 kilograms of weapons-grade HEU with sticks and garden rakes.

Much of this material was later moved to Britain for safekeeping. A cache of similar uranium elsewhere in the former republic met a different fate. In 1993, scientists at the Sukhumi research center in the Abkhazia region of Georgia piled cinder blocks around a building containing 2 kilograms of HEU, and fled oncoming fighting. A Russian team entered the abandoned building four years later, and found the material gone.

The Abkhazia affair remains the only confirmed case of missing weapons-grade fissile material in the world. To this day, no one knows where this HEU is. "It may be in the hands of the Abkhaz separatists, or it may have been stolen by or sold to others," says Matthew Bunn, of Harvard's Project on Managing the Atom.

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