The Soviet Union supported Uyghur nationalist propaganda and Uyghur separatist movements against China. The Soviets incited separatist activities in Xinjiang through propaganda, encouraging Kazakhs to flee to the Soviet Union and attack China. China responded by reinforcing the Xinjiang-Soviet border area specifically with Han Bingtuan militia and farmers. Since 1967 the Soviets intensified their broadcasts inciting Uyghurs to revolt against the Chinese via Radio Tashkent and directly harbored and supported separatist guerilla fighters to attack the Chinese border. In 1966 the number of Soviet sponsored separatist attacks on China numbered 5,000.