A few historical notes and a wrench to throw in
1918 The Soviets were anathematized and any who collaborated with them by St. Patriarch Tikhon of Moscow and the Russian Synod
1923 The Living Church hierarchy was condemned as unlawful and graceless By St. Patriarch Tikhon of Moscow and the Russian Synod
October 1, 1925 at the Second Renovationist Council the Synods of Constantinople and Alexandria entered into communion with the Living Church and both because of the direct influence of Meletius Metaxakis
When did the various Synods go into communion the Soviet Church? When did they add Sergius or Alexy I or maybe even later Soviet Patriarchs to their diptychs? It is always assumed it was immediately but the work of Subdeacon Nektarios shows it wasn't until 1945 Jerusalem and Serbia recognized Alexy I as Patriarch of Russia. Could it be possible other Synods were slow to recognize the Soviets? Did Constantinople and Alexandria remain in communion with the Living Church until the death of Alexander Vvedensky in 1946 or did they abandon the Living Church for the Soviet Church in 1943?
Dates the Synods joined the WCC
WCC established 1948
Cyprus, Greece, Constantinople, Alexandria, Antioch, Jerusalem 1948
America OCA 1953
Romania, Russia, Poland 1961
Bulgaria 1961 leaves in 1998
Georgia 1963 leaves in 1997
Serbia 1965
Czechoslovakia 1966
Japan 1973
Finland 1982
Albania 1994
Dates the Synods adopted the Revised Julian New Calendar or full Gregorian
Finland 1921
Constantinople, Greece, Cyprus, Romania, Russia (very briefly)1924
Alexandria, Antioch 1928
Albania 1937
Bulgaria 1968
Poland, Estonia, America OCA, Czechoslovakia, Ukraine flip flopped
Autocephalous and Autonomous dates
Rome, Alexandria, Antioch organically grew independence
Constantinople given independence by the Council of Constantinople 381
Cyprus given independence by the Council of Ephesus 431
Jerusalem given independence by the Council of Chalcedon 451
Georgia originally given independence by Antioch 1010, forcefully annexated by Russia 1818, declared independence from Russia 1917, recognized by the Soviet Church 1943
Russia declared independence from Constantinople 1484, recognized 1589
Sinai given independence by Constantinople 1575
Greece declared independence from Constantinople 1833, recognized 1850
Romania declared independence from Constantinople 1865, recognized 1885
Bulgaria declared independence from Constantinople 1870, recognized 1945
Serbia given independence by Constantinople 1879
Estonia originally given independence by Russia 1920, latter annexated 1940, declared independence from the Soviet Church 1993, too messy to explain in short form
Ukraine declared independence from Russia 1921, too messy to explain in short form
Albania declared independence from Constantinople 1922, recognized 1937
Finland declared independence from Russia 1923, too messy to explain in short form
Poland declared independence from Russia 1924, recognized by the Soviet Church 1948
Czechoslovakia given independence by the Soviet Church 1951
China given independence by the Soviet Church 1957
Macedonia declared independence from Serbia 1967, recognized 2022
America OCA given independence by the Soviet Church 1970
Japan given independence by the Soviet Church 1970
Belarus given independence by the Soviet Church 1989
Moldova given independence by the Soviet Church 1991, too messy to explain in short form