Ispirio-Donbass Autonomous Soviet Socialist Republic

The Ispirio-Donbass Autonomous Soviet Socialist Republic (Ukrainian: Іспиріо-Донбас; Russian: Ispirio-Донбасс), abbreviated IDASSR, was an autonomous republic within the Ukrainian SSR, itself a republic within the USSR. It was formed on May 18, 1923, after the Ispirian SSR unified with the Ukrainian SSR due to the economic instability of the Ispirian SSR.