Iran and North Korea signed up to the Nuclear Non-Proliferation Treaty (NPT) as non-nuclear weapon states. Development of nuclear weapons programmes would be in direct contravention of their legal obligations under the NPT not to acquire or seek to acquire nuclear weapons or other nuclear explosive devices. We continue to call on them to respect these obligations and abandon their weapons programmes. In contrast, the UK is recognised under the NPT as a nuclear weapon state. Ministers are considering the issues involved in the question of whether or not to replace the Trident system but final decisions have yet to be taken.