Aivaras Abromavičius, a Lithuanian businessman and former economy minister of Ukraine, has been appointed to the supervisory board of Ukraine's defence industry association Ukroboronprom.
The decree was signed by the country's new president Volodymyr Zelensky on Wednesday.
Ukroboronprom was involved in a big corruption scandal before the presidential election in Ukraine. Media reported that an advisor to former president Petro Poroshenko made huge profits by selling smuggled military equipment from Russia to the Ukrainian army.
Abromavičius served as Ukraine's minister of economy in 2014-2016, under President Poroshenko, but resigned saying that his reforms were being blocked by influential interest groups.
The 43-year-old Lithuanian was involved in Zelensky's campaign.
He was also previously mentioned as a possible conservative candidate to run for the mayor of Vilnius, but decided not to participate in Lithuanian politics.