The primary concern regarding nuclear proliferation is the spread of nuclear weapons to non-state actors, such as terrorist organizations or rogue states, which could increase the risk of nuclear terrorism or nuclear war.

The Nuclear Non-Proliferation Treaty (NPT) is an international treaty designed to prevent the spread of nuclear weapons. It was signed in 1968 and has been ratified by over 190 countries.

The main goal of the Comprehensive Nuclear-Test-Ban Treaty (CTBT) is to ban all nuclear explosions, for both military and civilian purposes. It was signed in 1996 but has not yet entered into force.

India is not a party to the Nuclear Non-Proliferation Treaty (NPT). It conducted its first nuclear test in 1974 and has since developed a nuclear weapons program.

Nuclear deterrence is the term used to describe the situation in which two or more nuclear-armed states have the ability to inflict unacceptable damage on each other in a nuclear war. This situation is designed to prevent either side from initiating a nuclear attack.

The United States is considered to be the first nuclear power. It conducted the first nuclear test in 1945 and has since maintained a large nuclear arsenal.

Nuclear disarmament is the term used to describe the process of reducing the number of nuclear weapons in the world. This can be achieved through a variety of means, such as arms control agreements, unilateral disarmament, and nuclear weapons destruction.

The Soviet Union is considered to be the second nuclear power. It conducted its first nuclear test in 1949 and quickly developed a large nuclear arsenal.

Nuclear blackmail is the term used to describe the situation in which a nuclear-armed state threatens to use nuclear weapons in response to an attack by a non-nuclear state.

The United Kingdom is considered to be the third nuclear power. It conducted its first nuclear test in 1952 and has since maintained a small nuclear arsenal.

Nuclear retaliation is the term used to describe the situation in which a nuclear-armed state uses nuclear weapons in response to an attack by a non-nuclear state.

France is considered to be the fourth nuclear power. It conducted its first nuclear test in 1960 and has since maintained a small nuclear arsenal.

Nuclear counterattack is the term used to describe the situation in which a nuclear-armed state uses nuclear weapons in response to an attack by another nuclear-armed state.

China is considered to be the fifth nuclear power. It conducted its first nuclear test in 1964 and has since developed a significant nuclear arsenal.

Nuclear counterterrorism is the term used to describe the situation in which a nuclear-armed state uses nuclear weapons in response to an attack by a non-state actor.