The Korea Asia-Pacific Peace Committee (KAPPC) released a white paper on Saturday criticizing the 1988 US-Japanese nuclear pact, which was extended last month, the Korean Central News Agency reported.
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According to the white paper, Japan has been conducting nuclear research since long ago, allegedly starting to push forward the A-bomb development in 1930s.
The document accused the United States of a double-standard approach to treat North Korea and Japan differently on nuclear issues, calling on Washington to "judge the situation from a fair stand" if it wanted denuclearization of the Korean Peninsula.
In July, the United States and Japan extended a bilateral nuclear cooperation agreement, which granted Japan the right to extract plutonium, reprocess spent fuel and enrich uranium on the condition that it was not used to build nuclear weapons.