Armenians in Nagorno-Karabakh noted similar though slower demographic trends and feared an eventual "de-Armenianization" of the area.[1] When tensions between Armenians and Azeris were reignited in the late-1980s by the Nagorno-Karabakh conflict, Azerbaijan's Popular Front managed to pressure the Azerbaijan SSR to instigate a partial railway and air blockade against Armenia, while another reason for disruption of rail service to Armenia were attacks of Armenian forces on the trains entering the Armenian territory from Azerbaijan, which resulted in railroad personnel refusing to enter Armenia.[16][17] This effectively crippled Armenia's economy, as 85% of the cargo and goods arrived through rail traffic. In response, Armenia closed the railway to Nakhchivan, thereby strangling the exclave's only link to the rest of the Soviet Union.