It is not so long ago that the superpowers USA and USSR stood against each other with a arsenal of weapons that had the goal to destroy this planet multiple times. This game takes its participants back to a period of cold war, the distrust and the first disarmament negotiations.
As speaker of a military power, each of the players tries to decrease the worldwide arsenal of weapons and perhaps to be the first one to reduce their arsenal to zero. Army, Air Force and Navy are repeatedly decimated. Some countries may have nuclear weapons, but nobody knows for sure. Conferences allow the search for a partner for a disarming agreement. If the negotiations fail, a one-sided disarmament might avoid a crisis.
If no agreement is made, then the arms race continues, and new weapons are purchased. If a country has disarmed too far, it may be easy prey for a power-hungry despot who doesn't care for world peace.