Eastern churches
Appearance of the icon of the Mother of God of Kazan
Съ праздникомъ (more on the icon)

During Soviet rule the late Fr John Mowatt of San Francisco’s Russian Catholic church helped save the most important surviving copy of this icon, which the late Pope gave back to the Russian Church last year.

Today the icon returned to the city of Kazan (more)

AFAIK the Roman Catholic authorities in Russia maintain an honourable policy of not proselytising born Orthodox, instead looking at the long-term goal of corporate reunion, possible with the Orthodox and not with Protestants.