U.S. sanctions are limiting tanker activity for Russia's top shipping group, Sovcomflot, the company's head said on Tuesday, as Washington tightens the screws on Moscow.The U.S. imposed sanctions on Sovcomflot on Feb. 23 as Washington seeks…<p><p>https://www.marinelink.com/news/us-sanctions-impacting-sovcomflots-513004</p></p>