Eastern and central Cambodia were firmly under the control of Vietnam and its Cambodian allies by 1980, while the western part of the country continued to be a battlefield throughout the 1980s, and millions of land mines were sown across the countryside. The Khmer Rouge, still led by Pol Pot, was the strongest of the three rebel groups in the Coalition Government, which received extensive military aid from China, Britain and the United States and intelligence from the Thai military. Great Britain and the United States in particular gave aid to the two non-Khmer Rouge members of the coalition.