'How to fix write.csv to save the data in Cyrillic characters?

When I save the data by employing base write.csv, it transforms all the Russian characters into <U+041F>. The same exactly happens with write_csv of readr package within tidyverse. What can I do to preserve the same characters while saving?

<U+041F><U+0440><U+043E><U+0434><U+0430><U+0435><U+0442><U+0441><U+044F> 
<U+043A><U+0432><U+0430><U+0440><U+0442><U+0438><U+0440><U+0430>


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