MOSCOW, Jan. 29 – Ukraine's national oil and gas company Naftogaz Ukrayiny filed a claim against Gazprom with the Arbitration Institute of the Stockholm Chamber of Commerce on October 13, 2014, concerning the retroactive review of a transit contract for 2009-2019, Gazprom said.

"On 13 October 2014 National JSC Naftogaz Ukrayiny submitted a request for arbitration to the Arbitration Institute of the Stockholm Chamber of Commerce, Sweden, against OAO Gazprom, seeking: