A recent addition to the EWTN library includes the Holy Father's homily given
at Kyiv. I include this extract:

http://www.ewtn.com/library/PAPALDOC/JP2BYZKY.HTM

Byzantine Liturgy is proof of unity and diversity that belong to ecclesial
communion
3. "That they may all be one". This is the mystery of the Church willed by
Christ. Unity founded on revealed Truth and on Love does not nullify man, his
culture or his history; rather it makes him part of the communion of the
Trinity, in which everything authentically human is enriched and
strengthened.
This is a mystery that is well represented also in this Liturgy,
concelebrated by Catholic Bishops and priests of the Eastern and Latin
traditions. In the new humanity, born from the Father's heart, and having
Christ as its head, and living through the gift of the Spirit, there is a
plurality of traditions, rites, canonical disciplines which, far from
undermining the unity of the Body of Christ, on the contrary enrich it with
the gifts brought by each one. In this, the miracle of Pentecost is
continuously repeated: people of different languages, traditions, and
cultures feel united in the profession of the one faith within the one
communion that is born from on high.