Russia's Gazprom is to boost natural gas transit shipments via Ukraine due to the settlement of the issue related to filling Ukraine's underground storage facilities with gas and other compromise decisions taken by the Ukrainian side, according to businessman Dmytro Firtash.

"It's due to NJSC Naftogaz Ukrainy that along [with agreements to pump gas into the underground storage facilities] it has agreed that Gazprom will boost transit shipments," he said in Kyiv on Thursday.

According to Firtash, the additional amount of gas transit supplies will be redirected by Russia from another route.

"Gazprom will boost transit, redirect [gas] from another direction for partial compensation, [and] provide opportunities to [Naftogaz]… I believe that NJSC [Naftogaz] has gained from this – it's true that Gazprom hasn't lost either, as Ukraine has undertaken the liabilities to give an additional amount to SPOT in winter. I believe that Ukraine will earn 10% from pumping additional amounts – this is quite a lot," Firtash said.