MOSCOW — For months, President Vladimir V. Putin has predictably denied accusations of Russian interference in last year’s American election, denouncing them as fake news fueled by Russophobic hysteria.

More surprising, some of Mr. Putin’s biggest foes in Russia, notably pro-Western liberals who look to the United States as an exemplar of democratic values and journalistic excellence, are now joining a chorus of protest over America’s fixation with Moscow’s meddling in its political affairs.

“Enough already!” Leonid M. Volkov, chief of staff for the anti-corruption campaigner and opposition leader Aleksei A. Navalny, wrote in a recent anguished post on Facebook. “What is happening with ‘the investigation into Russian interference,’ is not just a disgrace but a collective eclipse of the mind.”

What most disturbs Mr. Putin’s critics about what they see as America’s Russia fever is that it reinforces a narrative put forth tirelessly by the state-controlled Russian news media. On television, in newspapers and on websites, Mr. Putin is portrayed as an ever-victorious master strategist who has led Russia — an economic, military and demographic weakling compared with the United States — from triumph to triumph on the world stage.