Censor.NET reports referring to official comment by the Ukrainian Foreign Ministry.
"The groundless detention and contrived, unfounded charges against the Ukrainian journalist of espionage is another confirmation of Russia's intention to increase pressure on Ukraine and illegally persecute Ukrainian citizens.
"Deliberate neglect of Ukraine's request to immediately let the Ukrainian consul visit Sushchenko comes as Kremlin's ongoing purposeful effort to cynically use Ukrainians for political purposes and violate human rights.
"We demand that the Russian Federation immediately release Roman Sushchenko and all other political prisoners, the citizens of Ukraine. We call on the international community to increase pressure on the Russian Federation to make it stop human rights violations and persecution of independent journalists the soonest possible," the statement notes.
As previously reported, members of Moscow's Public Monitoring Commission found Ukrinform news agency correspondent Roman Sushchenko in Lefortovo prison. The Lefortovo court of Moscow remanded the journalist in a two-month custody on charges of espionage (article 276 of the Criminal Code of the Russian Federation).
Later, Ukraine's Information Policy Ministry confirmed the detention of Sushchenko. The ministry said its legal department was collecting necessary information on the circumstances and reasons for the detention.
In turn, the FSB claims Ukrainian journalist Sushchenko is an agent of the Main Intelligence Directorate of Ukraine's MoD.
Lawyer Mark Feygin later reported that charges against Sushchenko would be brought on Friday, Oct. 7.
Related materials: Ukrainian hostages in Russia