Thailand's Supreme Court on Tuesday ordered Thaksin Shinawatra, a former prime minister of the country and its most powerful and polarizing politician, to be jailed for one year, ruling that he improperly served a 2023 prison term in hospital.

Shinawatra's political clan has for two decades been the key foe of Thailand's pro-military, pro-royalty elite, who view their populist brand as a threat to traditional social order.

The dynasty's momentum is flagging after a litany of legal and political setbacks, culminating in his daughter Paetongtarn Shinawatra being ousted last month from the prime minister's office.