Armenians in the region of Nagorno-Karabakh, which was promised to Armenia by the Bolsheviks but transferred to the Azerbaijan SSR by Stalin, began a movement to unite the area with Armenia. The majority Armenian population expressed concern about the forced "Azerification" of the region. On February 20, 1988, the Supreme Soviet of the Nagorno-Karabakh Autonomous Oblast voted to unify with Armenia. Demonstrations took place in Yerevan showing support for the Karabakh Armenians. Azerbaijani authories encouraged counter demonstrations. However, these soon broke down into violence against Armenians in the city of Sumgait. Soon, ethnic rioting broke out between Armenians and Azeris, preventing a solid unification from taking place. A formal petition written to Gorbachev and senior leaders in Moscow asked for the unification of the enclave with Armenia, but the claim was rejected in the spring of 1988. Until then, the Soviet leader had been viewed favorably by Armenians, but following his refusal to alter his stance on the issue, Gorbachev's standing among Armenians deteriorated sharply.