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Orthodox Christians can be circumcised for medical or hygienic purposes, but it is not mandatory.
Circumcision - Questions & Answers
They definitely are allowed to eat pork, and most do. There are fasts you are supposed to observe throughout the year, where you are supposed to abstain from all meat, including pork.
There are some African Orthodox branches (Coptic, Ethiopian, etc) where circumcision is mandated and pork is not allowed. But these churches are not in communion within the Eastern Orthodox Church as they split over Christological issues during the first few centuries of the church.