Matrix Games has announced the release of Nuclear War Simulator. Nuclear war simulator is a detailed realistic simulation and visualization of large-scale nuclear conflicts with a focus on humanitarian consequences. It lets you design conflict scenarios and estimate the consequences using a population density map and realistic weapons effects.
This software should help you answer the question: what will happen if Russia and the United States or India and Pakistan use their arsenals? You can design warheads, missiles and carries, place them on the map and execute attack plans to tell a credible story about how nuclear conflicts play out and what are the consequences. Using a high-resolution population density map and realistic weapons effects like blast, heat and radiation you can make an estimate of how many people will die in a conflict.
Using an intuitive UI you can design warheads, place them on missiles and into silos, on aircraft, TELs and submarines. You can then place the forces onto the map simply clicking on it or importing real-world locations from KMZ files.
More game information is available at the official Nuclear War Simulator web page.