How does the Eastern Orthodox Church view and understand the Eucharist/Communion that takes place in Protestant churches?

When a Protestant congregation meets together and claim to eat the Bread and drink the Wine of the Body and Blood of Christ Jesus, how does the Eastern Orthodox Church view and understand such eating and drinking of Protestants? When Protestants do so and claim to participate in "Communion," what does the EOC believe is really taking place? What does it mean and signify to the EOC? Is it valid "Eucharist/Holy Communion" when Protestants do so? Is it a sham? Is it something in-between?