China. Ministry of Public Security

The official Protocol in Safeguarding National Security and Social Order in Border Areas between China and North Korea outlines each country's responsibilities in regulating border crossings.

The Ministries of Foreign Affairs and Public Security expresses concern at the growing number of illegal border crossing among ethnic Koreans of Chinese nationality into North Korea.

In light of "anti-China crazed behavior on the part of Vietnam," the Chinese Foreign Ministry and Public Security Ministry have decided to abrogate a visa agreement with Vietnam.

The Ministry of Public Security briefs Premier Zhou Enlai, Deng Xiaoping, and Peng Zhen on the increase of ethnic Korean residents illegally crossing the border into North Korea.

The 4th Bureau of the Chinese Ministry of Public Security distributes an investigative report, conducted by the Public Security Office in the Yanbian Korean Autonomous Prefecture, which cites reasons and proposes solutions for the outflow of border residents into North Korea.