Driving investment in rail, cargo at Mariupol seaport was down 27% in January, year over year, to 335,000 tons, the port administration reports. By contrast, cargo was down 10% in 2018, over 2017. After Russian harassment of Ukraine-bound ships proved enduring, some shippers reacted by boycotting the port, Ukraine’s largest on the Azov. Far from marginal, Mariupol carried the largest volume of metal exports for Ukraine last year – 4.1 million tons, just over the 4 million from Odesa.