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| Soviet troops were sent to prop up the pro-Moscow regime |
The overthrow of Afghanistan's King Zahir Shah in 1973 sparked a chain of events that led to decades of unrest.
Reforms imposed by a Moscow-backed regime sparked rebellions and, in 1979, Soviet troops invaded Afghanistan.
US-backed Islamic fighters known as mujahideen - among them Osama Bin Laden - fought the Soviets and the country became a Cold War battleground.
In 1989, the USSR withdrew in defeat, leaving behind a devastated country and hundreds of thousands of Afghans dead.
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