The flag is actually the flag of Yugoslavia, heh. This precise version, without any symbols or crests, has been used for the last time back when Serbia And Mon

The flag is actually the flag of Yugoslavia, heh. This precise version, without any symbols or crests, has been used for the last time back when Serbia And Montenegro[1] was a thing. [1]: https://en.wikipedia.org/wiki/Serbia_and_Montenegro https://en.wikipedia.org/wiki/Serbia_and_Montenegro