German experts have been and still are active in an advisory capacity in Bulgarian government ministries as part of continuing implementation measures connected with the country's EU accession.

Germany gave full support to Bulgaria's applications for membership in the European Union and NATO.

In World War I, the Tsardom of Bulgaria fought alongside the German Empire as a member of the Central Powers and signed in 1915 the initially secret Bulgaria–Germany treaty.

In the aftermath of its defeat and territorial losses in the Balkan Wars Bulgaria felt betrayed and turned against its former ally Russia.

[1][2] In 1941, Bulgaria signed the Tripartite Pact, allying itself with Nazi Germany and the Axis Powers.