The Swiss government is to return $321 million to Nigeria that was seized from the family of former President Sani Abacha.
The assets were confiscated as part of criminal proceedings against Abba Abacha, son of Sani, who ruled Nigeria for five years until his death in 1998.
Nigerian investigators believe the former president stole more than $4 billion during his time in office.
Nigeria is also pursuing $480 million that has been seized in the US, but faces a laborious legal process to reclaim it.