He was arrested in 2008 along with his wife and charged with spying for Russia for over a decade. At the time of his arrest Simm was responsible for handling all of Estonia’s classified and top secret material regarding NATO. This prompted European and American security officials to describe Simm as the most damaging spy against NATO since the collapse of the Soviet Union in 1991. In February of 2009 Simm was sentenced to 12½ years in prison.

On Thursday, a county court in Estonia’s southeastern city of Tartu ruled that Simm is eligible for parole, because he has served the majority of his prison sentence without committing any disciplinary infractions. Officials from the Tartu County Prison and the prosecutor’s office agreed that early release would provide Simm with an incentive to abide with Estonian law. The court also stated in its decision that Simm had no more access to classified information and that he was of no further interest to foreign countries and intelligence organizations.

Simm is expected to be released within days, and will remain under probation until March of 2021. The court’s decision can be appealed by December 20.