According to http://amen.gr/index.php?mod=news&op=article&aid=3258 mr Spyrou greek-american politician, intends to do service in Agia Sofia of Istanbul, without authorities permission, at September 17, feast of saint-martyr Sofia and her three daughters, Pisti (Faith), Elpis (Hope) and Agapi (Love). He claims is orthodox, and Agia Sofia orthodox church, therefore deserves the right to do sevice there without authorities permission.
My opinion: First of all Orthodoxy is the Jesus Christ's teaching correct interpretation. About subject matter, the Lord said to samaritan woman:
"Woman, believe Me, an hour is coming when neither in this mountain nor in Jerusalem will you worship the Father... But an hour is coming, and now is, when the true worshipers will worship the Father in Spirit and Truth; for such people the Father seeks to be His worshipers. God is Spirit, and those who worship Him must worship in Spirit and Truth." (John 4:21-24)
Also He taught: "render to Caesar the things that are Caesar's" (Matthew 22:21, Mark 12:17, Luke 20:25)
Authorities (Caesar's) permission, is a prerequisite for do service in a particular church. Accordingly Orthodoxes do service in a particular church, only when get authorities permission, otherwise elsewere (1 Timothy 2:8). Mr Spyrou attempt is unorthodox, therefore he is not Orthodox and his attempr mere political activity. As for Agia Sofia, is touristic attraction and historic monument.