A Kaliningrad-focused subsidiary of Russia's Lukoil has been granted a right to explore for oil and gas in the Russian sector of the Baltic Sea.
The area includes the D33 oil field, discovered in 2015 using a Russian-made jackup drilling rig, according to Lukoil.
The firm says the field contains recoverable oil reserves of 21.2 million tons.
Kaliningrad is a Russia-controlled enclave between Poland and Lithuania, with coastline along the Baltic Sea.
According to Lukoil magazine, OilRu, Lukoil operates the Kravtsovskoye field in the Baltic Sea, discovered in 1983, 22km west of the Curonian Spit.
The collapse of the Soviet Union delayed the field's development, but it was revived in 1995 under Lukoil-Kaliningradmorneft and oil production started in June 2004, using a fixed ice-resistant platform (D-6), designed and built in Russia.