 Complete the following phrase:  As an aftermath of the August 1991 failed coup détat in Moscow Supreme Soviet of the Byelorussian SSR proclaimed the Declaration of Sovereignty a constitutional law on August 25 1991, making the republic de facto independent from the Soviet Union. The official name of the state was changed to the Republic of Belarus on September 19 1991 and on December 8 1991 it became one of the parties to sign the 