Oil ended Tuesday’s session flat after American sanctions on Russia’s largest oil producer helped to erase losses driven by lingering concerns that coronavirus will cut demand. The U.S. sanctioned a unit of Russia’s Rosneft PJSC for maintaining ties with Venezuela’s Nicolas Maduro and its state-run oil company. The restrictions come with a three-month wind-down period that expires May 20. The sanctions on Rosneft represent the latest effort by the U.S. government to increase pressure on Nicolas Maduro’s regime. Rosneft called the sanctions illegal and ungrounded. The tensions also come at a time when oil markets are awaiting a response from OPEC+ on production cuts. Russia, one of the largest exporters in the coalition, has been reluctant to curb oil output past the current production cuts. Prices have lost about 15% since the beginning of the year on fears the coronavirus outbreak will squeeze global demand for crude. West Texas Intermediate futures for March delivery settled at $52.05 a barrel on the New York Mercantile Exchange. There was no settlement Monday due to the Presidents’ Day holiday in the U.S.