Cambodia's Supreme Court has dissolved the country's main opposition party, leaving the government with no significant competitor ahead of elections next year.
The Cambodia National Rescue Party (CNRP) is accused of plotting to topple the government - charges it denies, and describes as politically motivated.
More than 100 party members are now banned from politics for five years.
Cambodia's Prime Minister, Hun Sen, has ruled for 32 years.
The one-time commander in Pol Pot's Khmer Rouge has long been accused of using the courts and security forces to intimidate opponents and crush dissent, but has for years allowed some measure of political opposition to his Cambodian People's Party.
The CNRP made unexpectedly strong gains in the 2013 elections, and had been set to fiercely contest next year's polls, which Hun Sen says will go ahead.
The ruling was made in response to a government complaint, and all of the CNRP's elected politicians will now lose their positions, including 55 seats in the 123-seat National Assembly.
Senior CNRP politician Mu Sochua, who has fled the country along with dozens of other MPs, told the BBC that the decision marked "the end of true democracy in Cambodia".
She called for sanctions, adding: "The international community cannot let democracy die in Cambodia by refusing to see that its has been dealing with a dictator for the past three decades."
Cambodia top court dissolves main opposition CNRP party - BBC News