1972 in the Vietnam War the number of air raids against North Vietnam during all of 1971. Prime Minister Lon Nol declared President of Cambodia. Unlike the former Cambodian leader, Norodom Sihanouk, Lon Nol was a U.S. ally. The U.S. 101st Airborne Division left South Vietnam, the last U.S. ground combat division to be withdrawn from South Vietnam. The Khmer Rouge bombarded with artillery Phnom Penh, the capital city of Cambodia, killing more than 100 civilians. This was the heaviest attack on Phnom Penh since the Cambodian Civil War began in 1970. The United States boycotted peace negotiations in Paris with the North Vietnamese, citing
1960 in the Vietnam War and peace. We want to preserve peace in order for our people to use their strength to build socialism." However, at the same meeting of the National Assembly southern leaders called for assistance and support from the north to support the Viet Cong who faced "an extremely unsafe situation." North Vietnam protested to Great Britain and the Soviet Union, co-chairmen of the 1954 Geneva Convention, about the large increase in the U.S. military presence in South Vietnam and accused the U.S. of preparing for "a new war." The South Vietnamese army reported that it had killed 931 Viet Cong and