The Church of Russia ...
The Church of Serbia is declared autocephalous in 1832, recognized by Constantinople in 1879.
The Church of Bulgaria is declared autocephalous in 1872, recognized by Constantinople in 1945.
With all due respect, you presented wrong facts.
First of all, there is neither "Church of Serbia" nor "Church of Russia" nor, I believe,"Church of Bulgaria".
There is Serbian Patriarchate (with the territory far exceeding present-day Serbia) and Patriarchate of Moscow and all Rys (sp?). I do not have the title of Bulgarians handy. There is a great difference between the proper name and the name you usually employ in English.
Second, Bulgars self-proclaimed autocephaly in 9th or 10th century, never recognized and terminated by Basil Bulgaroktonos in 1014.
Third, the autocephaly of Serbian Archbishopry (of Zica) was granted at the begining of 13th century, after 1204 (the year should ring the bell), I believe in 1235, as the result of negotiating skills of St. Sava, while he was also the mediator for the autocephaly of Bulgarians, recognized (I believe) in 1239.
Raising the Archbishop of Zica to Patriarch of Pec at the beginng of 14th century (I think 1325), and adjoining the territories of present-day FYROM, Albania and northern Greece to him (under the reign of Car Dusan) was the reason for a short-living anathema of Serbs by Ecumenical Patriarchate. The title of Patriarchate was simply not resumed after the fall of Smederevo (1454) by first elected primate, while parts of the Serbian church (and Bulgarian church) were adjoined to Ecumenical Patriarchate by the end of 15th century. However, the title of Srbian Patriarchate (and pertaining autocephaly) was restored again at the end of 16th century and revoked again at the end of 17th century following the order of Ottoman Sultan both for restoration and termination. Meanwhile, autocephaly of Serbian church never ceased in the parts not having been conquered by Ottoman Empire (Montenegro, then Austria, now: Italy, Croatia, Hungary, Romania and Ukraine). Austrian (Roman) Emperor Leopold signed the concordate at the end of 17th century, granting freedom of operation to Serbian Church in the entire empire. Present-day dispute between Serbian Church and Romanians about allegedly overlapping territories traces its roots to the status granted to Serbian Church by Emperor Leopold.
The title of Serbian Patriarchate was restored again in 1922 (or was it 1924?) by the Ecumenical Patriarchate, embracing all the parts of the Serbian Church again - those that were part of Ecumenical Patriarchate between middle 15th century to 20th century, along with those that were never part of Ecumenical Patriarchate after the begining of 13th century.
My sources are numerous, but suffice to refer to an arch-enemy Fortesque, having already been mentioned above by Isa Almisry. Before you ask for more sources, I must ask you for yours.