In the Fatima Apparition, the Theotokos, if it was her, asked the Roman pope and bishops to consacrate Russia to her immaculate heart to prevent it from spreading its errors to the world. Most Romans believe it was prophecy about the Communist Revolution and that, had the consacration happened, the revolution would have been prevented and, if it had happened after the revolution, the regime would have fallen much earlier. Some Romans, on the other hand, put "Orthodoxy" among the "errors of Russia" that can be spread if the consacration does not happen.
There is a controversy also, because pope Pio XII on October 31st, 1942, consacrated the whole world and all humanity to the Imaculate Heart. Some people believe that this consacration, because it obviously include Russia, attends the request. Others think it does not because it was not specific for Russia. It is also included in the request for the consacration that, should it happen, Russia would convert to Roman Catholicism and peace would reign in the world.
John Paull II made a second consacration in 84 thtat did not mention Russia by name but he said it was intended for her, and that it had been accepted in Heaven as such.
There are many odd things about the recent Roman apparitions of Mary. Some mariologists point that these differences signify that we are entering a "Marian Age"