The alleged spies at the center of the reputed spy swap are said to include Nikolai Filipchenko, who is reportedly an intelligence officer with the Russian Federal Security Service (FSB). Filipchenko was arrested by Lithuanian counterintelligence agents in 2015, allegedly while trying to recruit double agents inside Lithuania. He was charged with using forged identity documents to travel to Lithuania on several occasions between 2011 and 2014. His mission was allegedly to recruit officers in Lithuania’s Department of State Security in order to install listening bugs inside the office of the then-Lithuanian President Dalia Grybauskaite. In 2017, a district court in the Lithuanian capital Vilnius sentenced Filipchenko to 10 years in prison. The alleged Russian spy refused to testify during his trial and reportedly did not reveal any information about himself or his employer. He is believed to be the first FSB intelligence officer to have been convicted of espionage in Lithuania.

BNS reported that the Russians have agreed to exchange Filipchenko for two Lithuanian nationals, Yevgeny Mataitis and Aristidas Tamosaitis. Tamosaitis is serving a 12-year prison sentence in Russia, allegedly for carrying out espionage for the Lithuanian Defense Ministry in 2015. In the following year, a Russian court sentenced Mataitis, a dual Lithuanian-Russian citizen, to 13 years in prison, allegedly for supplying Lithuanian intelligence with classified documents belonging to the Russian government. Lithuanian authorities have refused to comment publicly about Filipchenko and Mataitis, saying that details on the two men are classified. According to BNS, the spy swap may involve two more people, an unnamed Russian national and a Norwegian citizen, who is believed to be Frode Berg, a Norwegian retiree who is serving a 16-year jail sentence in Russia, allegedly for acting as a courier for the Norwegian Intelligence Service.

BNS said on Wednesday that the Lithuanian State Defense Council, which is chaired by the country’s president, had approved the spy exchange, and that Moscow had also agreed to it. On Thursday, however, a spokeswoman for Russia’s Foreign Affairs Ministry said she had “no information on this issue” that she could share with reporters.