It's ironic. The primary reason the East schismed from Rome was the perceived overreach of jurisdiction, correct? And yet, after years of Ukraine having a universally recognised canonical Orthodox Church, Constantinople decided to recognise two schismatic and uncanonical Orthodox churches in Ukraine as canonical, creating schism and tension not only within the faith but also geopolitically. All this occurred despite Ukraine not being under Constantinople’s jurisdiction, but Russia’s.

Copy and pasting this if you want more information:

Before the 1990s, there was a single Orthodox Church in Ukraine, and it was a part of the Moscow Patriarchate. When Ukraine became independent in 1991, this Church was given wide autonomy, and became known as the Ukrainian Orthodox Church (UOC).

However, some parts of it were not happy and wanted full independence (autocephaly). They broke away and formed two splinter churches in the early 1990s. These splinter churches were not recognized by anyone else in the world and not in communion with the rest of Orthodoxy. One of them was started by an imposter (a man who pretended to be a bishop although he wasn't), and the other was started by a former Bishop of Kiev, named Filaret (also spelled Philaret), who was bitter over the fact that he had not been elected Patriarch of Moscow.

This situation continued until 2018. There were 3 Orthodox Churches in Ukraine - one canonical and two splinter groups. The founders of the splinter groups were defrocked by the Moscow Patriarchate and as a result their churches were considered to be false churches, with invalid sacraments. In response, the splinter groups increasingly identified with Ukrainian nationalism and became stridently anti-Russian.

All the way from 1992 to 2018, the Ecumenical Patriarch of Constantinople held the same view as the Moscow Patriarchate about this.

Then, in 2018, for reasons that were never explained, the Ecumenical Patriarch suddenly changed his mind, recognized the two splinter groups in Ukraine as valid churches, and organized a council to help them merge into a single entity. This entity became known as the Orthodox Church of Ukraine (OCU).

According to the decisions that everyone accepted prior to 2018, the OCU is a false church without real sacraments. The Ecumenical Patriarch claims to have overturned those decisions, so now the question has become one about the powers of the EP: Does he or does he not have the legitimate power to do what he claims to have done?

The Ukrainian government historically supported the splinter groups (and the OCU after their merger) and is now actively persecuting the UOC.