A well-known American hieromonk of the Russian Orthodox Church Outside Russia said, "If God wishes to grant salvation to some who are Christians in the best way they know, but without ever knowing the Orthodox Church—that is up to Him, not us. [...] There is no reason why we cannot call them Christians and be on good terms with them, recognize that we have at least our faith in Christ in common, and live in peace...."

Source: https://preachersinstitute.com/2019/08/31/salvation-of-christians-outside-the-orthodox-church/