As reported by Censor.NET referring to Radio Svoboda, this is evidenced by a survey of the Razumkov Center for Economic and Political Studies.
According to the survey, 15 percent of Ukrainians consider Russian their native language, 22 percent - both Ukrainian and Russian, and 2 percent of respondents name other languages.
In 2006, 52 percent of the surveyed called Ukrainian their mother tongue, 31 percent - Russian. This indicates a growing number of those who see Ukrainian or both languages as native, pollsters say.
At home, according to the survey, 44 percent of respondents speak Ukrainian, 5 percent - mostly Ukrainian, 13 percent - Russian, 11 percent - mostly Russian, and 25 percent use both languages.
At the same time, outside the home, 40 percent of those surveyed speak Ukrainian, 6 percent - mostly Ukrainian, 12 percent - Russian, 11 percent - mostly Russian, and 29 percent communicate both in Ukrainian and Russian .
The survey was conducted on Dec. 11-23, 2015 in all regions of Ukraine except Crimea and the occupied areas of the Donetsk and Luhansk regions. 10,071 respondents over 18 years were surveyed. The theoretical margin of error makes 1 percent.