On December 24, 1979, the Soviet Union invaded Afghanistan and Kabul was heavily occupied by Soviet Armed Forces. In Pakistan, Director-General of the ISI Akhtar Abdur Rahman advocated for the idea of covert operation in Afghanistan by arming Islamic extremists who formed the mujahideen. General Rahman was heard loudly saying: "''Kabul must burn! Kabul must burn!''", and mastered the idea of proxy war in Afghanistan. Pakistani President Zia-ul-Haq authorized this operation under General Rahman, which was later merged with Operation Cyclone, a programme funded by the United States and carried out by the Central Intelligence Agency.