Analysis of information sources in references of the Wikipedia article "朝鮮民主主義人民共和國外交" in Chinese language version.
The North Korean nuclear scientists were allowed to engage in their research in Russia until early 2015 when Pyongyang stopped paying an annual membership fee to the Russian government.
The North Korean nuclear scientists were allowed to engage in their research in Russia until early 2015 when Pyongyang stopped paying an annual membership fee to the Russian government.
