US President Joe Biden spoke by telephone with Nigerian President Bola Tinubu and expressed his gratitude for the release of the head of the financial crimes department of the Binance cryptocurrency exchange, Tigran Gambaryan.

Last week, Nigerian authorities dropped charges against Binance executive Tigran Gambaryan and allowed him to leave the country after eight months in prison. According to media reports, citing competent sources, release became possible after diplomatic efforts Biden administration, prompting Nigerian authorities to allow Ghambaryan to return home on humanitarian grounds.

On Tuesday, US President Joe Biden called Nigerian President Bola Tinubu to express his gratitude for Gambarian’s release. Nigerian Foreign Minister Yusuf Tuggar, during a State House briefing, said the telephone conversation lasted about 30 minutes.

Earlier, a spokesman for the Economic and Financial Crimes Commission (EFCC) of Nigeria said that the Federal High Court in Abuja had agreed to drop the charges against Gambarian. However, his employer, the Binance cryptocurrency exchange, remains a defendant in the case of laundering illegal proceeds on a particularly large scale.