MOSCOW — The Eurovision Song Contest became the latest, and perhaps least likely, front in the renewed East-West rivalry on Monday after a singer from Ukraine unexpectedly upset the odds-on favorite, a Russian.

The result had barely been announced on Saturday night in Stockholm when the habitual Kremlin propaganda machine found its voice, with the main television news shows, various members of Parliament and even the Foreign Ministry weighing in to smear the contest.

Yelena Drapeko, an actress turned member of Parliament, summed up the general mood by attributing the loss to what she called the demonization of Russia.

“Partly, this is a result of the propaganda and information war that is being waged against Russia,” she was quoted as saying by the TASS news agency. “We are talking about the general demonization of Russia, about how everything with us is bad, about how our athletes are all doping, our planes are violating airspace, all of this.”