Ukraine has barred Russia's entry for the 2017 Eurovision Song Contest from entering the country over a past performance in Russia-annexed Crimea, the Ukrainian security service (SBU) said Wednesday.

"The Security Service of Ukraine has banned the citizen of the Russian Federation Yulia Samoylova from entering the country for a period of three years," SBU spokesperson Olena Gitlianska wrote on Facebook. "The decision was taken just now."

Russia's annexation of Crimea in 2014 sent relations with Ukraine to an all-time low, and now even sporting or cultural events are potential sources of tension between the two.

Ukraine, which won the right to stage the 62nd Eurovision event after its contender won the 2016 competition, has previously said it would deny entry to certain Russian singers it deemed anti-Ukrainian.