IIR canon correctly, Azkaban is a uniquely British phenomenon. Dementors seem to only be found in Britain, and the British magical government somehow made a deal with them to keep them fed in Azkaban so they won't leave their island and rampage around.
Other countries must have their own arrangements for dealing with criminals. We saw that Grindewald was in a prison in Germany (reasonable, because that is where he waged war, not in Britain), but got no details about how that prison works.
Other countries must have their own arrangements for dealing with criminals. We saw that Grindewald was in a prison in Germany (reasonable, because that is where he waged war, not in Britain), but got no details about how that prison works.