Cambodian MPs have unanimously approved changes to the law that can further limit free speech and political activities, already under stress from the government of Prime Minister Hun Sen.
All 123 members of the National Assembly passed the changes to make lese majeste - insulting the monarchy - a criminal offence punishable by a fine and up to five years in prison.
A court dissolved the opposition Cambodia National Rescue Party last year at the government's behest and its MPs have been replaced by ones who support the government.
Broadly worded constitutional amendments were also passed banning foreign interference in Cambodian affairs and political activity that could be harmful to the national interest.
Hun Sen has been in power for three decades and while maintaining a framework of democracy, tolerates little opposition.
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In the past year, the government cracked down severely on its opponents and critics.
The government has said the lese majeste law is needed to protect the honour and reputation of King Norodom Sihamoni.
The 64-year-old is a constitutional monarch who plays a minimal role in public affairs, while Hun Sen exercises almost absolute control over politics.
