Something to think about though, eh?
And what makes that different Viruz? The fact that one missile can cause more destruction is enough to deter other nations from responding or from using.
There's been a lot of interest in Tactical Nukes, smaller than the Hiroshima and Nagasaki ones, to use in the battlefield to eliminate vast quantities of enemy troops and footholds. In fact, there's rumour that one of these were used in Iraq, and I'll find you the videos. But that is still nuclear war, just without world apocolypse.
Iraq Nuke video, skip to 3:50.