Russia's banned Eurovision contestant could perform at the show via satellite link, organisers say.
Julia Samoilova has been banned from Ukraine, hosting this year's contest, for entering annexed Crimea via Russia.
The European Broadcasting Union (EBU) said the competition had to "remain free from politics". A satellite link would be a first in Eurovision's 60-year-history, they added.
The Kremlin had called for a rethink of Ukraine's decision.
Samoilova is due to take part in the second semi-final. If she gets through to the final, she could also perform at that via live satellite link.