1980 Turkish coup d'état
Iran was perceived as a geopolitically important country for the West since it is an oil-rich country as well as one of the significant oil-supplier to the West. The West had concerns that the oil supply from Iran might be at risk when USSR invaded Afghanistan in 1979. Afghanistan, which neighbors both Iran and former USSR, acted as a buffer zone against USSR expansionism into the oil-rich countries, which included Iran as well. The West feared this invasion since the it could mean that the oil-supply to the West might be disrupted and owned by USSR.