"Moreover, we have reason to believe he's been targeted because of his work as a journalist", Meduza's CEO Galina Timchenko and editor Ivan Kolpakov said in a statement.
Golunov, a 36-year-old investigative reporter with Meduza, an independent Russian-language media outlet, was detained last week over allegations that he manufactured and dealt drugs.
The three newspapers said they welcomed the more lenient pre-trial conditions but said they did not consider the evidence presented by investigators to be convincing.More news: Rays take three of four from Red Sox
"We expect law enforcement agencies to scrupulously observe the law and demand maximum openness when it comes to the investigation", the statement said.
All of them say they suspect Ivan Golunov has been framed.
All three newspapers are privately owned but increasingly have to toe the government line.More news: Russian Federation still undecided on OPEC oil deal extension: Saudi
But the crude way supporters say Mr. Golunov was set up has triggered an unusual show of media unity and an uncharacteristically swift response from authorities nervous about social unrest at a time when President Vladimir Putin already faces disquiet over living standards. The few opposition and independent media that still operate in Russian Federation are under huge pressure, Kremlin critics say. She was commenting on the controversial case of investigative reporter Ivan Golunov, who was charged with drug dealing and placed under house arrest over the weekend.
His lawyer and supporters pointed to egregious violations in his case. A police raid on his apartment allegedly uncovered cocaine and more mephedrone.
By basing itself in an European Union country, Meduza can get around censorship from Moscow, although some of its journalists live in Russian Federation, including Golunov.More news: Kim Jong Un's half brother was Central Intelligence Agency informant
As well as Russian media, Golunov has provoked outrage from global media and statements of concern from European Union and the United States.