China has banned exports to North Korea of technologies and goods that could be used to make missiles and nuclear, chemical and biological weapons, the government said, as it moves to comply with UN resolutions.
Beijing, the North's sole major ally and economic lifeline, has publicly supported sanctions against Pyongyang in the past, though it has come in for criticism from the US and other countries for alleged lax enforcement.
China, which has tended to prioritise regional stability in its relations with the North, regularly calls for the denuclearisation of the Korean peninsula. But it has been reluctant to push North Korea too hard over fears it could result in a messy collapse of the regime.
Since North Korea conducted its third underground nuclear test in February, however, China has taken a harder stance, with President Xi Jinping telling an international forum in April there should be no tolerance for those who foster "chaos", remarks widely interpreted at the time as a criticism of North Korea.
The prohibition covers items including components for nuclear explosion devices, certain rocket systems and toxic gas monitoring and testing systems, according to a 236-page list released by the Ministry of Commerce and three other government agencies on Monday.