Ukraine has barred Russia’s Eurovision entry from performing in the contest.
Julia Samoilova was chosen to perform her song, Flame Is Burning, in Kiev this May.
But she was handed a travel ban after she performed in Crimea, annexed by Moscow in 2014.
The European Broadcasting Union (EBU), which founded Eurovision, said it was ‘deeply disappointed’ by the news.
‘We have to respect the local laws of the host country, however we are deeply disappointed in this decision as we feel it goes against both the spirit of the contest and the notion of inclusivity that lies at the heart of its values,’ it said in a statement.
‘We will continue a dialogue with the Ukrainian authorities with the aim of ensuring that all artists can perform at the 62nd Eurovision Song Contest.’
Senior Russian politician Frants Klintsevich was quoted by Ria-Novosti as saying Russia would boycott Eurovision contests if organizers failed to stand up for the singer.
Ukraine has blacklisted at least 140 other Russian artists.
Last year, singer Jamala won in Sweden with her song 1944 – about Stalin’s mass deportation of the Crimean Tatars during World War 2.