Ukrainian President Volodymyr Zelenskyy has been blocked from delivering a video message during the Eurovision Song Contest final because it is "against the rules".

Axar.az reports that the Ukrainian leader had asked to make a video appearance during the contest's Grand Final on Saturday, but his request was rejected by the event's organisers, the European Broadcasting Union (EBU).

The EBU, an alliance of 112 member organisations which includes this year's host broadcaster, the BBC, said it was concerned his appearance would risk politicising the event.

"The Eurovision Song Contest is an international entertainment show governed by strict rules and principles which have been established since its creation. As part of these, one of the cornerstones of the contest is the non-political nature of the event," a spokesperson said.