Only limited Black Sea ferries in operation
What about Black Sea ferries? Because of international crises there are no more ferries or cruise ferries to/from Russia since 2015. The only reliable shipping companies are UKR Ferry and Stena SeaLine between Ukraine, Turkey and Georgia, as well as some freight based ferries with UKR partner Navibulgar to/from Bulgaria.
Ferrylines.com will keep you informed.