The OCA has already called for an urgent pan-Orthodox synaxis to address the Ukrainian situation.
As did the Assembly of Canonical Orthodox Bishops of the USA during their meeting in Cleveland, OH last week.
The picture of the assembled hierarchs is worth 1000 words: Metropolitan Joseph (AOA) beside Archbishop Demetrios (GOA) and on the left flank, Metropolitan Savas (GOA) next to Bishop Thomas (AOA).
"...for the well-being of the holy churches of God and for the unity of all let us pray to the Lord"