LONDON/LISBON — A Dutch court has ruled a half-billion-dollar stake in the Portuguese oil company Galp linked to Angolan ex-first daughter Isabel Dos Santos must be handed over to Angola, lawyers for the southwest African country's state oil company said on Tuesday.

Dos Santos, a business tycoon who became Africa's richest woman, ran oil giant Sonangol from 2016 until 2017, when her father's four-decade rule ended. The acquisition of the stake was "tainted by illegality.”