Afghanistan's historic strategic position between the great civilisations of India, Persia and Central Asia has made it from the very beginning both a crossroads for trade and cultural exchange and an almost continuous battlefield. In the years since the Soviet invasion in 1979 the country has become the stage of an ongoing complex humanitarian emergency. The period of Soviet occupation was characterised by massive human rights violations. The Soviet army and its allies were involved in indiscriminate bombardments and targeted executions, while the were involved in guerrilla warfare. The USSR was forced to withdraw in 1989 and the remnants of Afghanistan's communist regime were defeated in 1992.