Second: "rogue scientist" who probably has sold schematics of primers and explosive devices to produce diamonds. It's more a case of organisational retardation of modern russian state when they deal with dual use technologies (not the first and certanly not the last case). If I recall well, he went to Iran after having his financial applications denied by american managers. He was ukranian citizen.
Third: infantry weapons smuggling from ex soviet states. What it has to do with russian generals and nuclear weaponry?
Last one is interesting one. The dude which photo you see as HRH avatar was helping "smuggling" infantry and not only weapons to roque georgian regions. The story is pretty much identical to the Iran-Contras affair. The only difference that ones (americans) were buying weapons on the black market, and others (Russia) without extra thoughts made such black market in Chechenia.
Neither of these cases can be relevant to the Nuclear Weapons Complex. Different laws, very different people and working attitude.