Russia is investigating an alleged vote theft at the Eurovision Song Contest.
Azerbaijan's foreign minister, Elmar Mammadyarov, said the country's mobile phone operators reported that Russia's Dina Garipova came second in the local vote, which would have given her 10 points. However, when the announcement was made on live television, there were no points for Russia.
Mr Lavrov called it an "outrageous incident" and said the points were stolen from Garipova.
Garipova finished fifth overall on Saturday, 17 points behind fourth-placed Norway, so 10 points would not have made a difference in the ranking.
Russians have been passionate about the contest for more than a decade. Dima Bilan's win in 2008 was treated as a major national triumph.
In Eurovision, votes compiled by national phone operators go to a television broadcaster in each country, which presents the tally via a live video link with the country hosting the competition.
Azerbaijan's ambassador to Moscow, renowned Soviet-era crooner Polad Bulbuloglu, told Russian television that it was "impossible" that Garipova did not score any points in his country. In its own voting, Russia gave the Azerbaijani entry the maximum 12 points.
A spokesman for the European Broadcasting Union which holds the competition, said the final tally for each country is a 50/50 combination of the telephone votes and the votes of a national jury. A country that received a good result in the telephone vote could still be left with no points in the overall tally if the jury gave its highest points to other contestants, he said.
The EBU said it has no plans to start any investigation since it has no indications that anything went wrong.