Why would Russia bother with a dirty bomb? Those are nearly worthless except as a terrorist weapon. If you can hit a target with a dirty bomb, why not hit it with something that will do real and serious damage instead? Spreading around some radiological material that consists of mostly alpha and beta emitters (types of radiation for you Leftist scientific illiterates) does little or nothing compared to blowing shit up or coating everything in mustard gas.
Hell, with cooler weather mustard gas is the gift that keeps on giving. It would produce horrific and immediate casualties for months. Conventional explosives and things like fuel-air explosives would demolish buildings and create immediate casualties or a large area. A dirty bomb is mostly a scare tactic. People won't be affected by one for months, or years. It's mostly a pollution problem and little more.
I guess the tards at the NYTs never took any science courses either...