The spokesperson for the Vanuatu prime minister, Sato Kilman, says criticising the leader for backing Indonesia's involvement at the Melanesian Spearhead Group could lead to instability in Vanuatu.
During the MSG summit in Fiji last month, Indonesia became an observer at the sub regional agency, raising complaints that the long standing call from the Melanesians of the Papua region for the same status had been ignored.
Richard Kaltonga has called on Mr Kilman's political opponents and NGOs not to politicise the Papuan issue.
He says the opposition leader Edward Natapei's call for Vanuatu to now pull out of the MSG is illogical nonsense.
Mr Kaltonga says the critics have shown ignorance and poor understanding of the prime minister's role at the MSG.