Abror Azimov told a Moscow court Tuesday that he had simply "followed instructions" in carrying out the attack on April 3, but had been unaware he was committing a terrorist act.
The minute-long, first-person clip begins with agents from Russia's Federal Security Service (FSB) speeding up to a bus stop where Azimov is sitting.
Investigators said he had spoken with the suspected suicide bomber, Akbarzhon Jalilov, by telephone before the attack and helped mastermind the operation from a Moscow suburb.
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On Monday, FSB officers detained Abror Azimov on suspicion of training Jalilov and delivered him to the Investigative Committee.
"My participation was indirect, I did not realize what I was doing, I was issued", Life cited Azimov.
M - Russia's security services have detained Akram Azimov, the elder brother of the suspected St. Petersburg Metro bombing organizer, saying he transferred money that helped fund the terrorist attack that killed 14 people, RT reported.
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Both Azimov brothers are naturalised Russian citizens from Kyrgyzstan.
The terrorist who detonated the explosive device died, too. Six people were arrested in St. Petersburg; two others were arrested in Moscow. All arrested suspects were put in detention.
The head of the FSB called on to bring the fight to counter the ideology of terrorism to a qualitatively new level.
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