Mexico plans to end crude oil exports in 2023 as part of a strategy by the nationalist government of Andres Manuel Lopez Obrador to reach self-sufficiency in the domestic fuels market.

Petroleos Mexicanos could end up spending about $1.6 billion to take over Royal Dutch Shell Plc’s Deer Park refinery, more than twice the price announced in May, even as its finances are so dismal the government is injecting billions of dollars into the state oil producer.

A ransomware attack that hit Mexico’s Petroleos Mexicanos is disrupting the company’s billing systems, according to people familiar with the situation.

Petroleos Mexicanos imported less gasoline and diesel in the second quarter as its refineries produced more fuel and the government cracked down on fuel theft.