Which country does this flag belong to?

Explanation

The flag of Bulgaria is a tricolour consisting of three equal-sized horizontal bands of white, green, and red. The flag was first adopted after the 1877–1878 Russo-Turkish War, when Bulgaria gained independence. The national flag at times was charged with the state emblem, especially during the communist era. The current flag was re-established with the 1991 Constitution of Bulgaria and was confirmed in a 1998 law.