Russian gas giant Gazprom said on Tuesday its total claims in Stockholm arbitration against Ukraine’s energy firm Naftogaz have increased to $31.76 billion. The Kremlin-controlled company said the new claims included $2.55 billion, which it said Ukraine had not paid as part of the “take-or-pay” clause for gas deliveries in third quarter 2015. (Reporting by Jack Stubbs and Vladimir Soldatkin; editing by Dmitry Solovyov)