Prosecutors had accused Ilya Pyanzin of drawing up the plot as a member of an armed group created on the orders of Chechnya's top Islamist rebel Doku Umarov.
At a closed hearing, Moscow city court sentenced Pyanzin to 10 years in a penal colony with a harsh regime, the prosecutor-general's office said on its website.
Pyanzin pleaded guilty to banditry, plotting an attempt on the life on a state official and illegally preparing and storing explosives, the statement said.
The Ukrainian authorities seized Pyanzin and another plotter in January 2012 after a third gang member died in a fire that apparently broke out as the plotters were building a homemade explosive device.
Russia aired televised confessions by Pyanzin and his fellow alleged plotter shortly before the March 2012 presidential election, prompting critics to suggest it was a Kremlin stunt to drum up support for Putin.
Pyanzin cut a strange figure in photographs taken when he was detained, as his face was daubed with a bright green liquid disinfectant that is usually used on children's cuts and bruises.
The other alleged plotter, Adam Osmayev, is standing trial in Ukraine.
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