BANGKOK — A Cambodian court has issued arrest warrants for eight opposition leaders who fled abroad for safety but say they are now trying to return.

The indictment in recent days by a government-controlled court in Phnom Penh, the capital, was the latest effort by Prime Minister Hun Sen to sideline opposition politicians and independent news outlets as he tries to maintain his 34-year grip on power.

Warrants were issued for Sam Rainsy, a founder of the Cambodia National Rescue Party, which has been dissolved; two of the party’s vice presidents, Mu Sochua and Eng Chhai Eang; and five other party members.

They were charged with incitement to commit a felony and plotting to commit treason, charges they say are without merit.