The Treaty on the Non-Proliferation of Nuclear Weapons, commonly known as the Non-Proliferation Treaty or NPT, is an international treaty, whose objective is to prevent the spread of nuclear weapons and weapons technology, to promote cooperation in the peaceful uses of nuclear energy, and to further the goal of achieving nuclear disarmament and general and complete disarmament. 

The NPT non-nuclear-weapon states agree never to acquire nuclear weapons and the NPT nuclear-weapon states in exchange agree to share the benefits of peaceful nuclear technology and to pursue nuclear disarmament aimed at the ultimate elimination of their nuclear arsenals

The NPT entered into force in 1970. With over 190 Parties, it is the most widely adhered to the treaty in the field of non-proliferation and disarmament. Under the NPT, non-nuclear-weapon States parties commit themselves not to manufacture or otherwise acquire nuclear weapons or other nuclear explosive devices while nuclear-weapon States parties commit not to in any way assist, encourage or induce any non-nuclear-weapon State party to manufacture or otherwise acquire nuclear weapons or other nuclear explosive devices. Nuclear-weapon States parties under the Treaty are defined as those that manufactured and exploded a nuclear weapon or other nuclear explosive devices before 1 January 1967, which includes five States.

While the IAEA is not a party to the NPT, it is entrusted with key verification responsibilities deriving from the Treaty. Each non-nuclear-weapon State party is required under Article III of the NPT to conclude a comprehensive safeguards agreement with the IAEA to enable the IAEA to verify the fulfillment of the State’s party obligation under the Treaty.

The IAEA, therefore, has a specific verification role as the international safeguards inspectorate, namely to verify the fulfillment of obligations assumed under the NPT by non-nuclear-weapon States party with a view to preventing the diversion of nuclear energy from peaceful uses to nuclear weapons or other nuclear explosive devices.

For the Republic of Tajikistan, the Treaty on the Non-Proliferation of Nuclear Weapons has entered into force on January 17, 1995.   

 Treaty on the Non-Proliferation of Nuclear Weapons 

Source: https://www.iaea.org/publications/documents/treaties/npt