The charges resulted from a six-year investigation led by the Swedish Security Service (SAPO), which is the country’s counterintelligence agency. SAPO reportedly launched the probe in 2017, based on suspicions that it harbored a spy in its personnel ranks.

The two brothers have been named by Swedish media as Payam Kia, 35, and Peyman Kia, 42. They were reportedly born in Iran and became Swedish citizens in 1994. It is also reported that Payam Kia worked for SAPO and had access to classified information from a host of Swedish government agencies. SAPO accuses the two men of having worked “jointly” to pass information to the Main Directorate of the Russian Armed Forces’ General Staff, known broadly as GRU.

According to Swedish authorities, the two men began spying for Russia in September of 2011 and continued until the fall of 2021. Peyman Kia allegedly acted as a courier, passing information and payments between his brother and his Russian handlers. Per Lindqvist, chief prosecutor for Sweden’s National Security Unit, told the Associated Press news agency that the Kia brothers case involved “extremely sensitive topics”, but did not elaborate. Some reports claim that Payam Kia had access to the files of Swedish spies operating abroad.

The younger of the two brothers was reportedly arrested in September of 2021. His older brother was arrested in November of the same year. They face up to life imprisonment. They both deny the charges against them.