 On 26 April 2011, Tymoshenko sued Firtash and RosUkrEnergo in a U.S. District Court in Manhattan, accusing them of manipulating an arbitration court ruling in Stockholm – the ruling had ordered Ukraine's state energy company, Naftogaz, to pay RosUkrEnergo 11 billion cubic meters of natural gas to compensate for fuel it had "expropriated" plus 1.1 billion cubic meters of gas as a penalty.Both Firtash and RosUkrEnergo officials denied the allegations and a U.S. judge dismissed the lawsuits in September 2015.Firtash and influential multi-time Minister Yuriy Boiko are alleged to be "close associates".