Here is a question about this article: In the 19th century, the Tsarist Government of the Russian Empire claimed that Ukrainian was merely a dialect of Russian and not a language on its own. The differences were few and caused by the conquest of western Ukraine by the Polish-Lithuanian Commonwealth. However, the dialects in Ukraine eventually differed substantially from the dialects in Russia.
What is the answer to this question: The conquest of western Ukraine by what country altered the language of Ukraine?
Polish-Lithuanian Commonwealth