Grazhdanskaya Oborona, Russian for Civil Defense, or ГО, often referred to as ГрОб, Russian for coffin were a Soviet-Russian rock band formed by Yegor Letov and Konstantin Ryabinov in Omsk, USSR, in 1984. They were one of the earliest Soviet and Russian psychedelic/punk rock bands. They influenced many Soviet and, subsequently, Russian bands. From the early 1990s, the band's music began to evolve in the direction of psychedelic rock and shoegaze, and band leader Yegor Letov's lyrics became more metaphysical than political.