Vladimir is dead wrong, it's not that nukes are a deterrent is that they aren't. Countless alliances have unloaded their arsenals and the targets took it in stride. The NPO has been a victim of the two best coordinated nuclear wars (MK, FAN) yet here they are, all nukes do is slow down the winner a bit.
If nukes were a true deterrent then all sides would have to play politics, since even an outnumbered opponent could take you down with him.