By Marianna Parraga and Shariq Khan HOUSTON/NEW YORK, Jan 28 (Reuters) - U.S. refiner Citgo Petroleum has bought Venezuelan crude oil for the first time since 2019, when it severed ties with its ​parent, state-run oil firm Petroleos de Venezuela, two sources familiar with the matter told Reuters on ‌Wednesday. The 830,000-barrel-per-day refiner, which is expected to be taken over by an affiliate of hedge fund Elliott Investment Management to pay Venezuela-linked creditors ‌following a court-ordered auc ...