FILE PHOTO: The logo of the Ukrainian national joint stock company NaftoGaz is seen outside the company’s headquarters in central Kiev, Ukraine, March 15, 2016. REUTERS/Valentyn Ogirenko/File Photo
FILE PHOTO: The logo of the Ukrainian national joint stock company NaftoGaz is seen outside the company’s headquarters in central Kiev, Ukraine, March 15, 2016. REUTERS/Valentyn Ogirenko/File Photo