Not really. I thought it was widely known that this happened. The FSB agents were caught red handed.
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"the
people who planted the bomb were identified as FSB operatives, the official version changed to “security training”.[52] FSB also initially reported that the explosives used by the terrorists was RDX (or “hexogen”). However, it declared later that the explosive was not RDX, but a mixture of aluminium powder, nitre (saltpeter), sugar and TNT prepared by the perpetrators in a concrete mixer at a fertiliser factory in Urus-Martan, Chechnya.[53][54] RDX is produced in only one factory in Russia, in the city of Perm.[21] According to David Satter, the FSB changed the story about the type of explosive, since it was difficult to explain how huge amounts of RDX disappeared from the closely guarded Perm facility.
Yuri Tkachenko, the police explosives expert who defused the Ryazan bomb, insisted that it was real. Tkachenko said that the explosives, including a timer, a power source, and a detonator were genuine military equipment and obviously prepared by a professional. He also said that the gas analyser that tested the vapours coming from the sacks unmistakably indicated the presence of RDX. Tkachenko said that it was out of the question that the analyser could have malfunctioned, as the gas analyser was of world-class quality, cost $20,000, and was maintained by a specialist who worked according to a strict schedule, checking the analyser after each use and making frequent prophylactic checks. Tkachenko pointed out that meticulous care in the handling of the gas analyser was a necessity because the lives of the bomb squad experts depended on the reliability of their equipment. The police officers who answered the original call and discovered the bomb also insisted that it was obvious from its appearance that the substance in the bomb was not sugar.[21][48] However, later at a press conference on the occasion of the Federal Security Service Employee Day in December 2001, Tkachenko denounced his previous conclusions and said the detonator was a hunting cartridge that it would not be able to detonate any known explosives.[55]
In March 2000, the Russian newspaper Novaya Gazeta reported the account of Private Alexei Pinyayev of the 137th Regiment, who guarded a military facility near the city of Ryazan. He was surprised to see that “a storehouse with weapons and ammunition” contained sacks with the word “sugar” on them. The two paratroopers cut a hole in one of the bags and made tea with the sugar taken from the bag. But the taste of the tea was terrible. They became suspicious since people were talking about the explosions. The substance turned out to be hexogen. After the newspaper report, FSB officers “descended on Pinyayev’s unit”, accused them of “divulging a state secret” and told them, “You guys can't even imagine what serious business you’ve got yourselves tangled up in.” The regiment later sued publishers of Novaya Gazeta for insulting the honour of the Russian Army, since there was no Private Alexei Pinyayev in the regiment, according to their statement.[56] At an FSB press conference, Private Pinyayev stated that there was no hexogen in the 137th Airborne Regiment and that he was hospitalised in December 1999 and no longer visited the range.[55]
According to Satter, all four bombings that occurred had a similar “signature” which indicated that the explosives had been carefully prepared, a mark of skilled specialists. There is also no explanation as to how the terrorists were able to obtain tons of hexogen explosive and transport it to various locations in Russia; hexogen is produced in one plant in Perm Oblast for which the central FSB is responsible for the security. The culprits would also have needed to organise nine explosions (the four that occurred and the five attempted bombings reported by the authorities) in different cities in a two-week period. Satter's estimate for the time required for target plan development, site visits, explosives preparation, renting space at the sites and transporting explosives to the sites was four to four and a half months.[21] "