Ukraine has requested the extradition of the State Hermitage Museum’s Alexander Butyagin, who seized artefacts including ancient Greek coins

The group of figures, known as “Orpheus and the Sirens”, is one of four artefacts the museum is repatriating to Italy based on new evidence

Heritage watchdog sees rise in posts from trafficking groups on Facebook

Experts say the haul, the result of a 14-year investigation, could raise as much as €15m for the country’s cash-strapped archaeological service