"The person is suspected of being one of the most wanted fugitives, South Korean national Do Kwon, a co-founder and CEO of the Singapore-based Terraform Labs," Filip Adzic, the Montenegrin interior minister wrote on Twitter.

In February, the U.S. Securities and Exchange Commission filed a civil lawsuit against Kwon and Terraform Labs in Manhattan federal court, accusing them of defrauding investors in what the regulator deemed a multibillion-dollar scheme.

"The former cryptocurrency king who is behind losses of over $40 billion, has been apprehended at the Podgorica airport with forged documents. The same person is being sought by South Korea, the United States and Singapore," Adzic said.

A police officer who asked not to be named told Reuters that an identification procedure was underway.

"If the identity of that person is confirmed, he will be placed in the extradition detention," he said.

Last week, the Wall Street Journal reported that the U.S. Justice Department was investigating the 2022 collapse of the TerraUSD stablecoin and had questioned former team members of Terraform Labs, which was behind the stablecoin.

(Reporting by Aleksandar Vasovic in Belgrade and Stevo Vasiljevic in Podgorica; Editing by Hugh Lawson and Emelia Sithole-Matarise)