Sorry for the double post above!
Also, I was once told by a Roman Catholic priest working the Middle East and who was very familiar with the EC's there that "we Catholics are entitled to venerate Sts. Mark of Ephesus and Photios privately." He had the icon of the "Pillars of Orthodoxy."
What is the Catholic Church coming to . . .

Again, Rome's age-old policy on this is that when an Eastern Church comes into communion with it, the saints that Church has always venerated and canonized itself remain with it as part of its patrimony.
Sts. Vladimir and Olha were canonized by the Orthodox Church and not by the Catholic Church - and they are in the Roman calendar.
Metropolitan Andrew Sheptytsky petitioned Rome to allow the newly formed Russian Catholic Orthodox Church (sic) to venerate all the saints of the Russian Orthodox Church - this petition was granted.
Other EC parishes today will often introduce newly-glorified saints into their own liturgical veneration. There is a Ukrainian Catholic Church in Welland that has icons on its walls of many Orthodox Saints, including St Paisius Velychkovsky, the teacher of the Jesus Prayer, St John Maximovych of Siberia and many others.
St Seraphim of Sarov is also now on the Roman Catholic calendar and he was glorified a saint by Orthodoxy in 1903. Pope John Paul II had a great devotion to St Seraphim - also given that St Seraphim had a great devotion to the Mother of God that personally touched the heart of Pope John Paul II.
Fr Archimandrite Sergius Keleher was the first to inform me about the practice of Roman Catholic hierarchs attending Orthodox canonizations of Saints.
They attended the canonization of St Herman of Alaska, venerated his icon and took blessed icons of St Herman with them.
As Father Archimandrite said to me at the time, quite correctly, "If they don't recognize the canonization of Orthodox saints, why did they attend, why did they kiss the saint's icon and why did they accept icons of the saint to take with them?"
There is also the phenomenon of EC's and Orthodox venerating the same saint, but giving slightly different interpretations to their lives - each trying to make the saint "Orthodox" i.e. "against Catholicism" and the reverse.
St Vladimir's Orthodox akathist contains a pointed barb at the Catholics when it affirms that he disdained the "Western heresy" and received Orthodoxy.
Both EC's and Orthodox venerated St Job of Pochaiv but the akathist to St Job of Pochaiv has a number of barbs at the "uniates" whom it refers to as "New Hagarenes" (ie. "New Turks").
The Basilian Order actually promoted the official Cause of St Job of Pochaiv at Rome! The book by Met. Ilarion Ohienko on the Holy Pochaiv Lavra has a photocopy of a letter from a Basilian Ihumen speaking positively about the Cause of St Job. In fact, during the coronation of the Pochaiv Icon of the Mother of God (by the initiative of the great benefactor, Myron Pototsky, a friend of my ancestor, Auguste Jablonowskie

) medals of the Icon were struck for people to wear around their necks - on the back of the medal was an icon of St Job portrayed as he was on Orthodox icons.
St Job of Pochaiv was glorified a saint in 1654 by the Orthodox Metropolitan of Kyiv, Dionysius (Balaban), an ancestor of my dear wife's . . . fyi . . .
At first, the Basilians who took over the Lavra closed his shrine, but then they opened it when the people kept coming to pray at it.
The Basilians, to this day, often publish a picture in their books and magazines (including the little booklet, "Two Molebens and a Rosary") of a black-robed monk praying at an altar with the icon of the Mother of God, holding "chotki."
The picture has no inscription - but it is a picture of none other than St Job of Pochaiv, as we see in Orthodox publications and also the book by Met. Ilarion Ohienko!
Alex