sofia bulgaria foreign ministry say friday discussion revision treaty define border neighbor greece turkey would help stability region statement come day turkish president tayyip erdogan say visit greece detail treaty lausanne establish border modern-day turkey unclear last solution issue aegean cyprus need bulgaria believe discussion peace treaties exist border beneficial international community stability region ministry say revision international treaties may do mutual agreement countries accordance international law say urge neighbor continue path dialogue ministry say discuss issue turkish ambassador sofia erdogan make first visit turkish president greece 65 years say muslims greek border region western thrace able choose chief mufti christian communities turkey enjoy great freedom choose patriarchs suggest treaty apply fairly greek president prokopis pavlopoulos also rule revision 1923 lausanne treaty bulgaria say border treaty revision beneficial regional stability