Police believe an international drug ring has been disrupted after the arrest of four men and seizure of cocaine with a street value of $1.5 million.

The 2kg of cocaine bound for Australia was stopped at the border by New Zealand Customs last week and two Australians aged 27 and 49 and two Brazilians aged 23 and 26 arrested.

Police say the drug syndicate was importing drugs from South America into Australia, via New Zealand.

The men face a range of charges including importing a Class A controlled drug, conspiracy to export a Class A controlled drug, and possession and supply of a Class A controlled drug.

Police say it is believed more than 18kg of cocaine from this syndicate has been seized by Australian authorities in recent months.

The joint operation involved the Organised Financial Crime Agency of New Zealand, the Australian Federal Police, Queensland Police and Customs services on both sides of the Tasman.