In the interest of preserving a unified Moldavian SSR within the USSR and preventing the situation escalating further, then Soviet President Mikhail Gorbachev, while citing the restriction of civil rights of ethnic minorities by Moldova as the cause of the dispute, declared the Transnistria proclamation to be lacking legal basis and annulled it by presidential decree on 22 December 1990. Nevertheless, no significant action was taken against Transnistria and the new authorities were slowly able to establish control of the region.