The largest Russian energy companies are looking to explore more Arctic oil and gas resources on and offshore Russia, while Norwegian and other Western oil firms are digging exploration wells in Norway's Barents Sea.

Those companies lead the development efforts to tap more Arctic oil and gas resources as legacy oil and gas fields both offshore Norway and onshore Russia mature.  

Russia's biggest energy firms Gazprom, Rosneft, Novatek, and Lukoil, and Norway's oil and gas giant Equinor, as well as Aker BP and ConocoPhillips, are the top oil and gas producers in the Artic region, data and analytics company GlobalData said in a new report. Gazprom is the undisputed leader in Arctic oil and gas production, followed, at a long distance, by two other Russian firms, Rosneft and Novatek, GlobalData's estimates show.

Russian firms are ramping up exploration in Russia's Arctic, while Equinor and other Western companies drill exploration wells in Norway's Barents Sea, hoping for a significant discovery that could add to the Johan Castberg oilfield—a massive discovery which was made in 2011, but which hasn't been replicated in the Barents Sea so far.