Estonian spy sold Nato secrets
Herman Simm, a former head of security, pleaded guilty to treason on Wednesday.
The court where he was tried did not reveal which country he spied for, but investigators said Mr Simm passed nearly 3,000 documents to Russia.
They said he received 1.3m kroons (£73,000; $106,000) for the data. The Kremlin denied any involvement.
Nato made no comment, but the case, which is Estonia's biggest spy scandal since the Cold War, is seen as an embarrassment for the former Soviet state. Estonia joined Nato in 2004, angering Russia.
Read entire article at BBC
The court where he was tried did not reveal which country he spied for, but investigators said Mr Simm passed nearly 3,000 documents to Russia.
They said he received 1.3m kroons (£73,000; $106,000) for the data. The Kremlin denied any involvement.
Nato made no comment, but the case, which is Estonia's biggest spy scandal since the Cold War, is seen as an embarrassment for the former Soviet state. Estonia joined Nato in 2004, angering Russia.