Constitution of the Ukrainian People's Republic
The Constitution of Ukrainian People's Republic (Ukrainian: Конституція Української Народної Республіки, romanized: Konstytutsiia Ukrainskoi Narodnoi Respubliky) is a constitutional document approved by the Central Council of Ukraine on April 29, 1918, but never promulgated. Hence the document never acquired the legal power.
Source: Wikipedia — Constitution of the Ukrainian People's Republic (CC BY-SA 4.0)