In Soviet times, the Ukrainian name "КИЇВ" was transliterated into Russian as "КИЕВ." In other countries, the Soviet Union was primarily associated with Russia, so the name of the Ukrainian capital was translated from the Russian version to English as "KIEV."
As of today, the official language of the country is Ukrainian, and in the original language, the capital is spelled "КИЇВ." This means that the correct English transliteration is "KYIV."
In August 2012, the United Nations Conference on the Standardization of Geographical Names decided to change the official spelling rule for the name of the Ukrainian capital