In September 1999, a series of explosions destroyed apartment buildings in Moscow, Buynaksk, and Volgodonsk, killing approximately 300 people. The Russian government attributed the bombings to Chechen terrorists and used them as justification for launching the Second Chechen War — a conflict that transformed Vladimir Putin from an obscure prime minister into Russia's dominant political figure. A persistent alternative theory holds that the FSB (Federal Security Service) itself orchestrated the bombings as a false-flag operation to justify the war and enable Putin's political rise. The theory draws particular force from the Ryazan incident, in which FSB officers were caught placing what appeared to be explosive devices in a Ryazan apartment building, subsequently described by FSB Director Nikolai Patrushev as a "training exercise." The FSB false-flag theory remains unsubstantiated in the sense that no formal independent investigation has established FSB authorship; the circumstantial evidence, particularly the Ryazan incident, is genuine and troubling but does not constitute proof.