Ukraine's Naftogaz Discovered 'Substantial' Gas Reserves Offshore In The Black Sea; Ukraine's Naftogaz In Talks With Romania's OMV Petrom About Potential Partnership In Black Sea Gas Field; Naftogaz Black Sea Gas Find Was Made Before Russian War Started, Works On The Field Expected To Start After War Ends; Ukraine Holding Talks With Businesses, Governments To Attract Western Deep Sea Gas Extraction Technology To The Project