"To believe in Christ means to desire unity; to desire unity means to desire the Church; ... The elements of this already-given Church exist, found in their fullness in the Catholic Church" (UUS 9, 14). Looks like "ecumenism of return" to me.
Looks like "ecumenism of return" to me.
Sorry, no it doesn't and no non-Catholics interpreted it as such as I pointed out in the article from ecumenical review. (which was written five years after the encyclical) Even the Cardinals in the curia bluntly rejected the idea of ecumenism of return. JPII never clarified it.
Once again you ignored the contradictory paragraph and just cherry-picked the one's you liked.
10. In the present situation of the lack of unity amidst in the Catholic Church, which is governed by the Successor of Peter and by the Bishops in communion with him", and at the same time acknowledges that "many elements of sanctification and of truth can be found outside her visible structure. These elements, however, as gifts properly belonging to the Church of Christ, possess an inner dynamism towards Catholic unity".[11]
The whole encyclical is a mess of "there is unity" and "there is a lack of unity" and "there is true union but it's imperfect" Here's something that JPII never got. Truth is not imperfect. It's either a false unity or a true unity. And the Holy Spirit is not present in a false unity.