"On April 18, ambassador of Bulgaria in Russia [Atanas] Krastin was invited to the Russian Foreign Ministry, where he was presented with a note from the ministry declaring employees of the Bulgarian Embassy in Moscow personae non gratae," the ministry said in a statement, adding that this measure is response to Sofia’s decision to expel 10 Russian diplomats.
Bulgaria declared ten Russian diplomats personae non gratae last month following Russian Ambassador to Sofia Eleonora Mitrofanova's remarks on bilateral relations.