ping to various persons for various reasons
1- well first of all i don't know if suitcase sized nukes are really possible. High tech US sites might be able to make them. I doubt if many countries could.
2- i doubt, if al qaeda would be able to lay hands on them after the war on terror. If they had them before that, knowing how ruthless they are, they would have used them.
3- the russians could account for all their nukes and we could ask them, if they had any missing.
The loss of three cities would cripple the country for a century. Suitcase nukes will not cause loss of a city.