Photo by Roman Tsymbaliuk

Ukrainian journalist Roman Sushchenko, who has been captured in violation of international legislation and the fundamental human rights by Russia’s FSB, "not only covered the political, artistic, and cultural life of France but also exposed Russian propaganda in French news outlets," the Ukrainian embassy in the U.S. wrote in a statement.

"Freedom of the press is a fundamental principle of democracy, transparency, and the rule of law. The wrongful treatment of journalists like Roman Sushchenko is part of a larger trend of politically-motivated persecution and violation of fundamental human rights by Russian authorities. We join the international community in calling for their swift release," the diplomats quoted U.S. Congresswoman Marcy Kaptur as saying.

"We urge the US official representatives, international human rights organizations, wide journalists’ community to take all possible measures to expedite the release and return to Ukraine of Roman Sushchenko as well as all Ukrainian political prisoners illegally detained in Russia," the statement reads.

Read alsoIn flashback: Ukrainian journalist Sushchenko detained in Russia two years ago

As UNIAN reported earlier, Roman Sushchenko has worked for Ukraine’s news service Ukrinform since 2002. Beginning in 2010, Sushchenko has been reporting for the agency from France.

The Russian FSB detained Sushchenko at a Moscow airport upon his arrival on a private visit on September 30, 2016.

He was charged with "espionage," as the Russian authorities insist he is an "operative" of Ukraine's intelligence service.

The court started considering the Sushchenko case on March 27, 2018. On June 4, the Moscow city court unlawfully sentenced Sushchenko to a 12-year term in a high-security colony.

On September 12, the Supreme Court of the Russian Federation has upheld the verdict, overruling the lawyer's appeal.

Sushchenko says he pleads not guilty and will continue the struggle for his release, including by lodging a complaint with the European Court of Human Rights.