Dear brother Andrew,
It is my personal opinion is that this was done by HH JP2 of thrice-blessed memory, which was the principle cause of the Fall of communism. I don’t recall when he did it, but I remember that when the Berlin wall fell, there was talk in religious circles of the rather coincidental timing of the events (of the fall of the Wall and the consecration). I understand that there is a segment of Fatima devotees who did not think that consecration met all the conditions that the Theotokos requested at Fatima. I don’t know what these people are expecting, but I suspect these folks imagine the Fatima message has to do with the conversion of Russia to Catholicism.

Blessings,
Marduk
It was done in 1984. The Pope in Vatican Square:
"Mother of the Church! Enlighten the People of God along the paths of faith, hope, and love! Enlighten especially the peoples whose consecration and entrustment by us you are awaiting. Help us to live in the truth of the consecration of Christ for the entire human family of the modern world.
In entrusting to you, O Mother, the world, all individuals and peoples, we also entrust to you this very consecration of the world, placing it in your motherly Heart.
Immaculate Heart! Help us to conquer the menace of evil, which so easily takes root in the hearts of the people of today, and whose immeasurable effects already weigh down upon our modern world and seem to block the paths towards the future!
From famine and war, deliver us.
From nuclear war, from incalculable self-destruction, from every kind of war, deliver us."
For some reason when HH JP2 in a kneeling prayer position made that last specific pleading, I got the sense by the emotion in his voice that he really feared that as THE danger of that time.
The complete official Vatican statement on Fatima and the messages are here:
vatican.va/roman_curia/congregations/cfaith/documents/rc_con_cfaith_doc_20000626_message-fatima_en.html
When people start posting to sites that do not agree with the Vatican’s interpretation, I worry. We have to remain loyal to the Holy See, but there is a whole cottage market now of looking for holes in the Vatican’s analysis and arguing that Rome is hiding something. I believe to go down that road is very dangerous for it ultimately leads many faithful to distrust their own Pope, and that surely could not have been one of the fruits of Mary coming to Fatima. God Bless!