Gas storage data Tuesday show Ukraine has about 445 billion cubic feet of natural gas stored in underground storage tanks. That's 7.3 percent above the stocks as of June 1 and tanks are filled to 40.7 percent, data as of June 6 show.
Ukraine is working to resolve ongoing debt issues with Russian energy company Gazprom. The country hosts most of the natural gas Russia sends to European consumers and the lingering stalemate has raised questions about European energy security.
European Energy Commissioner Gunther Oettinger met Monday in Brussels with his Ukrainian and Russian counterparts. No final deal on resolving the gas row was reached, though the commissioner said talks would continue through this week.
Gazprom says Ukraine owes it billion of dollars in outstanding debt. European officials have said there would be no disruptions in gas deliveries so long as talks are ongoing.
Gazprom in 2006 and 2009 cut gas supplies through Ukraine because of similar debt issues.