ratio in the war is approximately 2:1 or 67%. One source estimates that 20% of the total population of North Korea perished in the war. Vietnam War The Vietnamese government has estimated the number of Vietnamese civilians killed in the Vietnam War at two million, and the number of NVA and Viet Cong killed at 1.1 million—estimates which approximate those of a number of other sources. This would give a civilian-combatant fatality ratio of approximately 2:1, or 67%. These figures do not include civilians killed in Cambodia and Laos. However, the lowest estimate of 411,000 civilians killed during the war (including civilians killed in Cambodia and Laos) would give a civilian-combatant fatality ratio of approximately 1:3, or 25%. Using the lowest estimate of Vietnamese military deaths, 400,000, the ratio is about 1:1. Chechen wars During the First Chechen War, 4,000 separatist fighters and 40,000 civilians are estimated to have died, giving a civilian-combatant ratio of 10:1. The numbers for the Second Chechen War are 3,000 fighters and 13,000 civilians, for a ratio of 43:10. The combined ratio for both wars is 76:10. Casualty numbers for the conflict are notoriously unreliable. The estimates of the civilian casualties during the First Chechen war range from 20,000 to 100,000, with remaining numbers being similarly unreliable. The tactics employed by Russian forces in both wars were heavily criticized by human rights groups, which accused them of indiscriminate bombing and shelling of civilian areas and other crimes. NATO in Yugoslavia In 1999, NATO intervened in the Kosovo War with a bombing campaign against Yugoslav forces, who were alleged to be conducting a campaign of ethnic cleansing. The bombing lasted about 2½ months, until forcing the withdrawal of the Yugoslav army from Kosovo. Estimates for the number of casualties caused by the bombing vary widely depending on the source. NATO unofficially claimed a toll of 5,000 enemy combatants killed by the bombardment; the Yugoslav government, on the other hand, gave a figure of 638 of its security forces killed in Kosovo. Estimates for the civilian toll are similarly disparate. Human Rights Watch counted approximately 500 civilians killed by the bombing; the Yugoslav government estimated between 1,200 and 5,000. If the NATO figures are to be believed, the bombings achieved a civilian to combatant kill ratio of about 1:10, on the Yugoslav government's figures, conversely, the ratio would be between 4:1 and 10:1. If the most conservative