Ukraine was a nation-state on Earth, in eastern Europe. Its capital city was Kiev.
Doctor Viktor Lozinak of Ukraine was a key member of the Chrysalis Project in the 1970s decade. (TOS novel: The Rise and Fall of Khan Noonien Singh, Volume 1)
In 2045, Tatya Bilash, a Ukrainian native, gave a first report of alien visitors to Earth to her aunt Mariya, a reporter in Kiev. (TOS novel: Strangers from the Sky)
Ukrainia Novya, a Human colony world, was settled largely by Ukrainian natives, and their heritage is reflected in the architecture, music, popular culture, and spoken language of the colony. (FASA RPG module: The Orions: Book of Common Knowledge)
Starfleet's GZK computer cores are based in Ukraine. (DS9 reference: Star Trek: Deep Space Nine Technical Manual)