Mexico's state oil firm has dismissed employees at its Salamanca fuel storage depot and has vowed to investigate others allegedly implicated in fuel theft.
The presidential decree, published in the official gazette on Thursday, also precludes the sale of Petrobras' stake in detergent producer Deten Química.
The deal with a group led by the International Finance Corporation will see Frontera pay US$225mn in cash over a 36-month period, plus accrued interest.
The order extends to former Petrobras CEO José Sérgio Gabrielli, ex-finance minister Antonio Palocci and three of the energy firm's directors.
The Brazilian energy giant's shareholders approved the sale of two subsidiaries to units of Mexican group Alpek earlier this year, but antitrust authority Cade is looking into the deal.