"There is a widespread opinion that the Eastern Churches permit a new marriage after divorce, and give communion to the remarried. But this is not the case, as Nicola Bux explains. Only the first marriage is celebrated as a true sacrament."The explanation referred to is "The Orthodox Church and Second Marriages", by Nicola Bux, translation by Matthew Sherry. As described, Orthodox practice appears more strict than the Catholic practice of divorce, annulment, and remarriage in the U.S.
It further appears that a half-century of post-conciliar ecumenism has not included even many Catholic cardinals actually studying-up on Orthodox belief and practice.