Author: Nicholas D. Kristof.

Nicholas D Kristof Op-Ed column contends that Chinese oil purchases have financed Sudan's pillage of Darfur; maintains that Chinese-made AK-47's have been main weapons used to slaughter several hundred thousand people in Darfur, and China has protected Sudan in UN Security Council; holds that it is because of China's support that Sudan felt it could get away with sending proxy army to invade Chad (M)