In September 1944,
Nazi Germany briefly sought to establish an
Independent State of Macedonia a
puppet state in the territory of the
Kingdom of Yugoslavia that had been occupied by the
Kingdom of Bulgaria following the
invasion of Yugoslavia in April 1941. When
Soviet Union forces approached the borders of Bulgaria near the end of August 1944, Bulgaria declared neutrality and briefly sought to negotiate with the
Western Allies. As the Bulgarian government was not impeding the withdrawal of German forces from Bulgaria or
Romania, that forced the Soviet Union to treat it with suspicion. On 2 September a new pro-Western government took power in
Sofia, only to be replaced a week later by a pro-communist government after a
Fatherland Front–led revolt. However, on 5 September 1944, the Soviets declared war on Bulgaria.