Kuwait's supreme court on Sunday sentenced a top bureaucrat to 10 years in jail for joining and fighting with the Islamic State militants group in Syria and Iraq.
The court also fined the unnamed Kuwaiti national, who was a top official at the Kuwait municipality, $30,000 and convicted him of calling other people to join the group.
The ruling is final and cannot be challenged.
Kuwaiti courts have sentenced a number of IS members, sympathisers and financiers to various jail terms.
A lower court in December sentenced a Filipina to 10 years in jail after convicting her of joining the militants group and plotting attacks.
Authorities in July said they had dismantled three IS cells plotting attacks, including a suicide bombing against a Shiite mosque and against an interior ministry target.
An IS-linked Saudi suicide bomber killed 26 worshippers in June 2015 when he blew himself up in a mosque of Kuwait's Shiite minority, in the worst such attack in the Gulf state's history.