file photo: A logo is seen on the roof of the ArcelorMittal steelworks headquarters in Ostrava, Czech Republic, April 1, 2016. REUTERS/David W Cerny/File Photo
file photo: A logo is seen on the roof of the ArcelorMittal steelworks headquarters in Ostrava, Czech Republic, April 1, 2016. REUTERS/David W Cerny/File Photo