President Emmanuel Macron has described rioting in the French-Pacific territory of New Caledonia as an "unprecedented insurrection movement" that no-one saw coming, reports the BBC.
During a tour of police headquarters in the capital Nouméa on Thursday, he said the coming days and weeks would be difficult, but Paris would "go until the end" to restore calm.
Six people, including two police officers, have been killed and hundreds more wounded in riots, looting and arson triggered by a controversial electoral reform.
New Caledonia, a group of islands between Australia and Fiji, has been a French territory since the 19th Century. Tensions have been high for some time between the central government in Paris and indigenous Kanaks who make up about 40% of the tiny archipelago.
Kanak protesters fear that a new law giving voting rights to French residents who have lived there for more than 10 years will dilute the influence of the indigenous population.
However, the violence that began on 13 May is the worst unrest seen there since the 1980s.
A state of emergency has been imposed and President Macron has said that a 3,000-strong force deployed from France will remain - even during the Paris Summer Olympics if required.
Arriving in Nouméa after a 24-hour flight from Paris, President Macron said he wanted the return of peace, calm and security "as quickly as possible".