The downfall of Najibullah, the president of Afghanistan from 1987 to 1992, and the People’s Democratic Party of Afghanistan (PDPA) was caused mainly by the collapse of the Soviet Union, which ended the military and economic aid his government depended on. As government forces weakened and key commanders defected to the mujahideen, he was forced to resign in April 1992 as rebel forces entered the capital, Kabul.
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