FILE PHOTO: The Russian vessel Tantal, an oil/chemical tanker, is berthed at the far eastern city of Vladivostok, Russia April 3, 2016. Picture taken April 3, 2016. REUTERS/Stringer/File Photo
FILE PHOTO: The Russian vessel Tantal, an oil/chemical tanker, is berthed at the far eastern city of Vladivostok, Russia April 3, 2016. Picture taken April 3, 2016. REUTERS/Stringer/File Photo