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| 1964, Jan. 5 |
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| French defense minister Pierre Messmer, conferring in Phnom Penh with Prince Sihanouk, offered French tanks, trucks, and combat aircraft to Cambodia to help defend its neutrality. | 1 |
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| Feb. 8 |
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| Prince Sihanouk charged the U.S. with “great responsibility” for the South Vietnamese attack on a Cambodian village on Feb. 4, and asked the U.S. to finance truce observation posts along the Cambodian–South Vietnamese border. | 2 |
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| Feb. 11 |
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| Prince Sihanouk proposed an international conference to guarantee Cambodia's neutrality, and on Feb. 19 suggested that Thailand, South Vietnam, and the U.S. sign an agreement to neutralize Cambodia. | 3 |
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| March 10 |
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| A delegation left for Beijing and Moscow to negotiate arms purchases. | 4 |
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| March 11 |
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| Cambodians attacked the British and U.S. embassies and information offices. Prince Sihanouk offered his regrets and withdrew his demand for a four-power conference to guarantee Cambodia's borders. | 5 |
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| March 24–25 |
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| Cambodia and South Vietnam formally ended their border talks, and Prince Sihanouk reiterated his demand for an international conference. The British government rejected a Soviet request that their two nations, as cochairs of the 1954 Geneva Conference on Indochina, call an international conference on Cambodian neutrality. In a letter to Prince Sihanouk, Pres. Charles de Gaulle promised to use his influence with the U.S. and Britain to effect the calling of an international conference. | 6 |
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