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The prohibition on testing

No state engaged in conduct in 2021 that contravened the TPNW’s prohibition on testing. North Korea is the only state that is known to have engaged in explosive nuclear testing since 1998, with its last test detonation occurring in September 2017.

A screen grab from North Korea’s state television channel shows North Korean leader Kim Jong-un inspecting what was said to be a thermonuclear bomb near Pyongyang, North Korea, on 3 September  2017. North Korea's last nuclear test explosion was carried out hours after this and other images were released.
A screen grab from North Korea’s state television channel shows North Korean leader Kim Jong-un inspecting what was said to be a thermonuclear bomb near Pyongyang, North Korea, on 3 September 2017. North Korea's last nuclear test explosion was carried out hours after this and other images were released. Photo: Stephen Shaver/UPI/Shutterstock/NTB
Compliance and compatibility with the TPNW's prohibition on threatening to use nuclear weapons
Compliance and compatibility with the TPNW's prohibition on threatening to use nuclear weaponsns
ARTICLE 1(1)(a) - INTERPRETATION