Sihanouk’s “Thank You, Hồ Chí Minh Trail” (1973)
In 1970, the head of state of Cambodia, Norodom Sihanouk, was overthrown by one of his military officers, Lon Nol.
Sihanouk, who had declared Cambodia to be a neutral state, was in Moscow at the time. He then flew to Beijing. In Beijing, Premier Minister Zhou Enlai summoned Vietnamese Prime Minister Phạm Văn Đồng, and together they convinced Sihanouk to form a government-in-exile and resist Lon Nol.
Sihanouk proceeded to do so, and in the process, he decided to support a group that was also opposed to Lon Nol, the Khmer Rouge.