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What are the secret negotiations in history?

From May to August 1939, Britain and Germany held secret negotiations to adjust their relations, realize cooperation between Britain and Germany, and divide their spheres of influence.

On July 8, 1971, during his visit to Pakistan, Kissinger secretly boarded a Pakistan Airlines Boeing 707 and flew to Beijing. From July 9 to 11, Zhou Enlai held talks with Kissinger, opening a new chapter in Sino-US relations.