Ukraine had a government of its own and the Ukrainian language gained usage in state affairs. As the Rada was eventually overthrown in a German-backed coup (April 29, 1918), the rule of a Hetmanate led by Pavlo Skoropadskyi was established. While the stability of the government was only relative and Skoropadsky himself, as a former officer of the tsarist army, spoke Russian rather than Ukrainian, the Hetmanate managed to start an impressive Ukrainian cultural and education program, printed millions of Ukrainian-language textbooks, and established many Ukrainian schools, two universities, and a Ukrainian Academy of Sciences. The latter established a Committee on Orthography and Terminology, which initiated a scholarly and methodological research program into Ukrainian terminology. The Hetmanate's rule ended with the German evacuation and was replaced by the Directorate government of Symon Petlura. However, Ukraine descended into a new wave of chaos facing two invasions at the same time, from the East by the Bolshevik forces and from the West by the Polish troops, as well as being ravaged by armed bands that often were not backed by any political ideology. 1923–1931: Early years of Soviet Ukraine As Bolshevik rule took hold in Ukraine, the early Soviet government had its own reasons to encourage the national movements of the former Russian Empire. While trying to ascertain and consolidate its power, the Bolshevik government was by far more concerned about political oppositions connected to the pre-revolutionary order than about the national movements inside the former empire. The reversal of the assimilationist policies of the Russian Empire was potentially done to help to improve the image of the Soviet government and boost its popularity among the common people. Until the early-1930s, Ukrainian culture enjoyed a widespread revival due to Bolshevik policies known as the policy of Korenization ("indigenization"). In these years a Ukrainization program was implemented throughout the republic. In such conditions, the Ukrainian national idea initially continued to develop and even spread to a large territory with traditionally mixed population in the east and south that became part of the Ukrainian Soviet republic. The All-Ukrainian Sovnarkom's decree "On implementation of the Ukrainization of the educational and cultural institutions" (July 27, 1923) is considered to be the onset of the Ukrainization program. The (August 1) decree that followed shortly "On implementation of the equal rights of the languages and facilitation of the Ukrainian language" mandated the implementation of Ukrainian language to all