Sâr arrived in Saigon on 13 January 1953, the same day on which Sihanouk disbanded the Democratic-controlled National Assembly, began ruling by decree, and imprisoned Democratic members of parliament without trial. Amid the broader First Indochina War in neighboring French Indochina, Cambodia was in a civil war, with civilian massacres and other atrocities carried out by all sides. Sâr spent several months at the headquarters of Prince Norodom Chantaraingsey—the leader of one faction—in Trapeng Kroloeung, before moving to Phnom Penh, where he met with fellow Cercle member Ping Say to discuss the situation. Sâr regarded the Khmer Việt Minh, a mixed Vietnamese and Cambodian guerrilla subgroup of the North Vietnam-based Việt Minh, as the most promising resistance group. He believed the Khmer Việt Minh's relationship to the Việt Minh and thus the international Marxist–Leninist movement made it the best group for the Cercle Marxiste to support. The Cercle members in Paris took his recommendation.