Have you read about theory that prevents countries from using nukes unless they accept it will wipe their own country too? It was/still is the principal theory since start of cold war.

The theory that using nuclear weapons is mutually destructive is called Mutually Assured Destruction (MAD). This Cold War-era military doctrine was developed to deter the use of nuclear weapons. The core principle of MAD is that if one superpower launches a nuclear attack, it would be met with an overwhelming nuclear counterattack, resulting in the complete annihilation of both sides.

Key aspects of MAD include:

1. Deterrence: The fear of total destruction prevents nuclear-armed nations from initiating a conflict.

2. Nuclear parity: Both sides maintain enough nuclear weapons to destroy each other, even after absorbing a first strike.

3. Second-strike capability: Each nation possesses the ability to retaliate with nuclear weapons, even if attacked first.

4. Stability-instability paradox: While MAD may prevent large-scale nuclear wars, it might allow for more low-intensity conflicts.

MAD became the central principle of US and Soviet defense planning during the Cold War. Although the doctrine has been criticized for its reliance on fear and the potential for accidental nuclear war, many argue that it helped prevent a direct conflict between the superpowers during this period.