[citation needed] In 1996-1997, he worked as a staff member of the Publishing Council of the Russian Orthodox Church, specializing in drafting liturgical guidelines.

[1] In December 1998, he was a member of the Moscow Patriarchate's delegation at the Eighth Assembly of the World Council of Churches (Harare, Zimbabwe) and was elected to the WCC Central Committee.

[4] On October 4, 2012, the Holy Synod appointed him representative of the World Russian People's Council at the UN and assigned him to St Nicholas Cathedral in New York City.

[7] On August 1, 2014, in Church of George the Great Martyr at Poklonnaya Hill during the Divine Liturgy the Episcopal Consecration of Archimandrite John (Roshchin) as Bishop of Naro-Fominsk was performed by: Patriarch Kirill of Moscow and all Russia, Metropolitan Juvenaly (Poyarkov) of Krutisty and Kolomna, Metropolitan Hilarion (Alfeyev) of Volokolamsk, Archbishop Mark (Golovkov) of Yegorievsk, Bishop Sergius (Chashin) of Solnechnogorsk.

"[10] Nestor (Sirotenko) [ru] was the previously the primate of the diocese of Chersonesus,[11] but he was replaced by John (Roshchin) by the Holy Synod on 28 December 2018.

[10][12] On May 30, 2019, the Holy Synod of the ROC decided to appoint archbishop Anthony (Sevryuk) of Vienna and Budapest as primate of the PEWE and of the diocese of Chersonesus.

[13] On August 30, 2019, by the decision of the Holy Synod of the ROC, he was released from the administration of the Diocese of Budapest and Hungaria with a change of title to "of Vienna and Austria".