Gazprom Export's first deputy director Mikhail Sereda and his wife, former Gazprombank vice-president Yulia Sereda, laundered Gazprom mafia money in Europe. The Portuguese prosecutor's office and the country's financial intelligence are investigating a case of money laundering and violation of sanctions against one of the closest associates of Gazprom CEO Alexei Miller - Mikhail Sereda and his wife, Portuguese citizen Julia, who worked as a vice president of Gazprombank. Sereda holds the post of first…