The basic framework of Japan’s nuclear policy, consisting of four pillars, was established just before the Treaty on the Non-Proliferation of Nuclear Weapons (NPT) was opened for signature in 1968....

中文翻译：

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东亚安全环境变化及其对日本核政策的影响

日本核政策的基本框架由四大支柱组成，是在 1968 年《不扩散核武器条约》（NPT）开放签署之前制定的。