According to the FSB, the attacks were planned by a senior Daesh commander in Turkey who had been put on an international wanted list by Tajik authorities.
"The activity of a terrorist cell consisting of citizens of Tajikistan and a citizen of Moldova, who planned to commit a series of resonant terrorist attacks in Moscow using improvised explosive devices of high capacity, has been terminated," the FSB said.
Four members of the terrorist group have been detained on Thursday. Improvised explosive devices, firearms and a "significant amount of explosive material to develop explosives of high capacity" have been found and seized from the suspected terrorists.
Earlier in December, Russian President Vladimir Putin said at a meeting with senior officers and prosecutors that the FSB prevented 10 terrorist attacks in the first 10 months of 2016.