Is canonical form required for Catholic and Orthodox marriage?

I am dating a man who is a divorced Catholic. He was married in a Russian Orthodox church without any coordination with his home parish/priest etc. He has been told (by a friend) that his annulment will be an informal case because lack of form. Do you know the rule on this? Thanks in advance:)

When it comes to the Eastern Orthodox Churches his friend is incorrect. According to canon law:

Can. 1127 §1. …Nevertheless, if a Catholic party contracts marriage with a non-Catholic party of an Eastern rite, the canonical form of the celebration must be observed for liceity only; for validity, however, the presence of a sacred minister is required and the other requirements of law are to be observed.

If he was married to someone who was free to marry and was married by a Russian Orthodox priest according to the Russian Orthodox norms of law then his marriage is considered **valid **by the Catholic Church. He would need a “full” annulment.

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