His most notable works were Korotka heohrafiia Ukrainy (Brief Geography of Ukraine) and the first Ukrainian world map.[3] For the former, he published it in two volumes in 1910 and 1914, and wrote it for schools and the general reader.[3] In the book, he championed the terms "Ukraine" and "Ukrainians" and explained that "Rus" and "Rusyn" were outdated for the area, and considered terms like "Malorossiia" (Little Russia) to be inappropriate for foreign actors.[3] The latter was published in 1907, which was the first world map featuring Ukrainian-language place names.[3]
On 33 September 1933, Rudnytsky was arrested by the DPU of the Ukrainian SSR, accused of being a member in the counter-revolutionary organization, sabotage, and espionage. He was sentenced to five years in “Svirlag” camps (Vepsland) and the Solovetsky Special Purpose Camp (SLON Gulag). His students were also arrested. Rudnytsky was also sentenced to forced labour in the White Sea–Baltic Canal.[4] In 1935, he was transferred to the Solovets Islands. In late 1937 he was transferred from the islands to another Siberian forced-labor camp. On October 9, 1937, the NKVD tribunal of Leningrad oblast sentenced Rudnytsky to death. He was executed by shooting on November 3 in the Sandarmokh grove. His execution was part of the mass repressions against Ukrainian intelligentsia.[1][5][6]
In 1965, Stepan Rudnytsky was officially rehabilitated by Soviet authorities, acknowledging that the charges against him were unfounded. This was largely prompted by the efforts of geographers at Lviv University, who advocated for the restoration of his reputation. Following his rehabilitation, Rudnytsky's work began to be recognized by scholarship and historians as a foundational figure in Ukrainian geology.[6][5]