In respect of the Dispute Concerning Coastal State Rights in the Black Sea, Sea of Azov, and Kerch Strait (Ukraine v. the Russian Federation), Ukraine has filed its Memorial, 19 February 2018, to the Arbitral Tribunal Constituted under UNCLOS, Annex VII.
For more information see the Statement of Ukraine’s Foreign Ministry here, and PCA Case No. 2017-06 page here.