This is a GIGANTIC LIE! In case you didn't know already, Pope Pius XII consecrated Russia to the Immaculate Heart of Mary in 1952.
He may have buried a line in one of his typical 50-page letters, but he did NOT carry out the consecration on the terms that Our Lady requested.
Entire point of the request was that she was to be publicly honored, and thus why all the bishops of the world had to be involved, since you couldn't sneak this in on page 20 of some obscure allocution or letter written in German.
Thus, having been done publicly, even the most faithless would end up having to attribute the dramatic restoration of the Church (the Triumph of her Immaculate Heart) to Our Lady.
If you think that the 1952 consecration its effect, say, in 1989-1991 (as the Iron Curtain "fell"), then you disgrace Our Lady. When the consecration is happened, the effect will be dramatic, it will be immediate, and it will restore in a total conversion of any left in the world who are of good faith.
Sister Lucia herself, before she was swapped out and the new one contradicted her, stated that this did not meet the conditions of Our Lady's request.