The suspects include the alleged gunman, Lyubomir Korba, whom Russia says fled to the UAE after the attack.

According to the FSB, Dubai extradited the attacker, Lyubomir Korba, born in 1960, who targeted Lieutenant-General Vladimir Alekseyev, to Russia

Lieutenant General Vladimir Alexeyev, deputy head of Russia's military intelligence arm, was shot several times in an apartment block in Moscow on Friday.