Bulgarian opera singer Raina Kabaivanska teaches a student during her annual masterclass for young singers in Sofia Opera and ballet in Sofia on October 1, 2024. (Photo: AFP)
A view of a hardware of the Gaz-System's gas station in Rembelszczyzna, near Warsaw, Poland, April 27, 2022. Polish and Bulgarian leaders accused Moscow of using natural gas to blackmail their countries. (Photo: Czarek Sokolowski/AP)
