Switzerland said it regrets a decision by Thai authorities not to extradite Swiss national Xavier Justo, a possible key witness in the global money-laundering probe linked to Malaysian state fund 1Malaysia Development Berhad (1MDB).
Malaysia's 1MDB, once a pet project of Prime Minister Najib Razak who chaired its advisory board, is the subject of money-laundering investigations in at least six countries, including Switzerland, Singapore and the United States.
Justo was jailed for three years in Thailand in August 2015 after the police said he admitted to blackmail and attempting extortion of his former employer Petrosaudi, a Saudi Arabia-based oil and gas company and joint venture partner of 1MDB.
Justo leaked several confidential documents from Petrosaudi relating to its joint venture with 1MDB that were published by Malaysian and international media groups early last year, and formed the basis for the graft and money laundering probe.
His sentence was cut to two years by a royal amnesty in August, prompting the Swiss authorities to request his transfer to serve the remaining term back home.