Russian crude oil shipments continued to increase on a four-week average basis, despite maintenance work that reduced flows out of the port of Primorsk on the Baltic Sea last week, tanker-tracking data monitored by Bloomberg showed on Tuesday. Russian crude oil exports from its ports averaged around 3.28 million barrels per day (bpd) in the four weeks to December 17—an increase of about 80,000 bpd compared to the four-week average to December 10, according to the data reported by Bloomberg’s Julian Lee. In the four…