Cambodian Prime Minister Hun Sen has threatened to "shame" Australia and block the release of a joint statement at a regional summit in Sydney next month if he faces pressure over a political crackdown at home.
The strongman has been chastised by Western countries for taking a hammer to Cambodia's democracy in recent months by dissolving the main opposition party, shuttering independent news outlets and pursuing critics in the courts.
In a speech on Wednesday the notoriously brash leader said he would not tolerate any pressure on domestic politics when he attends a summit of the 10-member Association of Southeast Asian Nations (Asean) hosted by Australia in March.
"Hun Sen can block the release of any statement between Asean and Australia... Australia cannot pressure Cambodia. Don't dare," he said of a regional bloc that operates by consensus.
"If you treat me inappropriately, I will hit back and leave shame on your face at the scene," Hun Sen added.
The premier also warned would-be protesters in Australia, where there is a sizeable population of Cambodian refugees from the Khmer Rouge years, not to burn his image in any demonstrations.
It would not be the first time Cambodia has used its intransigence to block or dilute an Asean statement.
In 2012 Asean foreign ministers failed to release a joint communique for the first time at the end of their annual gathering, with the Philippines blaming event host Cambodia for blocking criticism of Beijing's actions in the South China Sea.