[Glock22]

I'm pretty sure that the existence of Soviet 'suitcase nukes' has been thorughly debunked. Not that they didn't explore the idea, but the best they could come up with was still the size of several footlockers, and very, very heavy. And the small mass of fissible (fissile?) material meant that they would decay into ineffectiveness relatively quickly so that they would have to be 'refreshed' with new material frequently, which was a real pain, since these weapons were of course being held in reserve for decades against a time of war with the West. They just proved too impractical, and were disassembled.

A dirty bomb, on the other hand, would be easier. But it would not produce a 'Hiroshima'.

[Oztrich Boy]

Soviet suitcase Nuke

Worrl Nust Daily Suitcase Nuke

[LM_Guy]

That Orange thing (W54 Tactical Nuke) doesn't look that big to me !!

Also Russia was supposed to have deployed 3000 to 4000 tactical nukes, many in countries like the Ukraine and Chechnya which is where the Black Market nukes that Al-Quada was reported to have bought came from...!!

Sources:  Center for Defense Information and Natural Resources Defense Council.
 

Davy Crockett bazooka-type
missile with W54 nuclear warhead