Russia wants the jailed arms dealer back in Moscow and is discussing a prisoner swap with the United States that could see him exchanged for Americans imprisoned in Russia including basketball star Brittney Griner.
Reed was ultimately freed in return for Konstantin Yaroshenko, a Russian pilot jailed in the United States on drug trafficking charges.
For some experts, the Russian state's continued interest in Bout, plus his skills and connections in the international arms trade, hint strongly at Russian intelligence ties.
In interviews, Bout has said he attended Moscow's Military Institute of Foreign Languages, which serves as a training ground for military intelligence officers.
“His case has become totemic for the Russian intelligence services, who are keen to show that they don’t abandon their own people,” Galeotti added.