Not to be outdone by the Vietnamese military build-up, the Government of Democratic Kampuchea was busy strengthening its armed forces with Chinese support. In previous years, China had only provided the KRA with a limited quantities of arms and ammunition, but as relations with Vietnam worsened in 1978, Beijing established additional supply routes through Kampuchea and increased the volume of military hardware which travelled down each route. On the eve of the Vietnamese invasion, Kampuchea had an estimated 73,000 soldiers in the Eastern Military Zone bordering Vietnam. At that time, all branches of the Kampuchean armed forces were significantly strengthened by large quantities of Chinese-made military equipment, which included fighter aircraft, patrol boats, heavy artillery, anti-aircraft guns, trucks and tanks. Additionally, there were between 10,000 and 20,000 Chinese advisers in both military and civilian capacities, providing their support to the Khmer Rouge government. Finally, China's PLA stationed a few hundred thousand soldiers on its own border with Vietnam (which would eventually be deployed in the brief Sino-Vietnamese War), as well as nearly two million soldiers in its border with the Soviet Union.