Olga Valeyeva was accused of discrediting Russia’s military and promoting extremist symbols after a video showed her singing Red Viburnum.
The 19th Century military march is popular among Ukrainian nationalists.
Valeyeva, who said she had been unaware of the song’s associations, was fined 40,000 roubles
A second woman who had sung the song along with her was given 10 days in jail.
Crimea’s Russian-installed interior ministry posted a video where the two women publicly apologise for singing the song.
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