FILE PHOTO: A logo of DTEK (Donbass fuel-energy company) is seen on a building of a business centre in Kiev, Ukraine, March 11, 2016. REUTERS/Valentyn Ogirenko/File Photo
FILE PHOTO: A logo of DTEK (Donbass fuel-energy company) is seen on a building of a business centre in Kiev, Ukraine, March 11, 2016. REUTERS/Valentyn Ogirenko/File Photo