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| 1967, May 2 |
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| Sihanouk assumed special powers as head of a provisional government, which at once accorded full recognition to the Vietnamese National Liberation Front (Viet Cong) and to North Vietnam. | 1 |
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| 1969, July 2 |
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| Resumption of diplomatic relations with the U.S., which recognized the sovereignty, independence, neutrality, and territorial integrity of Cambodia. | 2 |
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| Aug. 8 |
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| Lon Nol again became premier. | 3 |
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| Oct. 8 |
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| Sihanouk permitted the invasion of 40,000 North Vietnamese forces and their advance even into central Cambodia. | 4 |
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