[4] The Khmer Rouge classified the USSR as an unfriendly country and in November 1973, the Soviet Ministry of Foreign Affairs withdrew all diplomatic personnel from Democratic Kampuchea.

Immediately after the Fall of Phnom Penh, Moscow turned to the new leadership of Democratic Kampuchea with a proposal to restore full-fledged diplomatic relations between the countries.

In September 1977, the diplomats of Democratic Kampuchea left Moscow without explanation, leaving the building of the Cambodian embassy unattended.

[1][2] Relations between the two began to sour once more in March 2022 after Hun Sen condemned Russia for invading its neighbor, Ukraine and the country voted in favor of an UN resolution.

[7] It has been alleged that Cambodia’s foreign ministry wanted to remain strictly neutral and abstain at UN votes, similar to Vietnam and Laos, in the days after Russia invaded Ukraine on February 24, 2022, but Hun Sen intervened and ordered his diplomat at the UN to co-sponsor a resolution condemning Moscow.