At least four tankers, most ‍of them loaded, that had departed from Venezuela in early January in “dark mode” - ‍or with their transponders off amid a strict US blockade - are now back in the South American country’s waters, according to state company PDVSA and monitoring service TankerTrackers.com.A flotilla of about a dozen loaded vessels and at least ⁠three other empty ships left Venezuelan waters last month in apparent defiance of an embargo imposed by US President Donald Trump since mid-December, which has dragged down the country’s oil exports to minimum.For all the latest headlines follow our Google News channel online or via the app.One of the ships, the Panama-flagged supertanker M Sophia, was intercepted and seized by the US this week when returning to the country; while another, the Aframax tanker Olina with a flag ‍from Sao Tome And Principe, was intercepted but released to Venezuela on Friday, state company PDVSA ‍said.Three more of ‍the vessels that had ⁠departed in that