VIENNA - China reiterated on Monday the great importance it attaches to nuclear security, saying it has earnestly performed its international obligations.

"China has ratified the Amendment to the Convention on the Physical Protection of Nuclear Material and the International Convention for the Suppression of Acts of Nuclear Terrorism," Wang Yiren, vice chairman of China Atomic Energy Authority, said in his statement at the International Conference on Nuclear Security, adding that China has carried out extensive international cooperation to strengthen the world's nuclear security work.

"IAEA (International Atomic Energy Agency) is playing an irreplaceable role in facilitating international cooperation in nuclear security and improving the nuclear security in the world," Wang noted.

Over 100 countries are represented at the International Conference on Nuclear Security this week in Vienna, capital of Austria, to discuss nuclear security issues, including the safeguard of nuclear material and the prevention of nuclear terrorism.