ISN Security Watch, 12 Apr 07: Ultranationalists Shift to Terror Tactics
...There have been documented cases of employees of Russian nuclear facilities stealing enriched uranium and plutonium. There was also one case in which a Russian nuclear physicist stowed away his own stash of plutonium before retiring "just in case" he might need it. In comparison, Vlasov's case represents a dangerous phenomenon: Here, a veteran of the Russian nuclear industry has committed a grave crime based on his racist beliefs, rather than greed...

....Vlasov's act also raises grave concerns given the emerging trend of increasingly violent ultranationalism - a trend that once only included an arsenal with metal bars, knives and other individual weapons, but has lately grown to include more lethal weapons, such as explosives as well as mercury....

...agencies must diversify their counterterrorism efforts to focus not only on jihadist groups based in the North Caucasus, as is now the case, but also on the increasing propensity for terrorism among ultranationalist groups with special attention paid to the prevention of nuclear, biological or chemical attacks by xenophobic and other ideologically motivated insiders.

In particular, increasing use of terrorist methods by individual ultranationalists and groups requires urgent joint action and coordination between counterterrorism, anti-extremism units of national law-enforcement agencies and security services and those units which monitor personnel and general security at nuclear facilities....
The SOVA Center is a Russian NGO with a particular focus on this topic.