Ukrainian journalist Roman Sushchenko, former Russian prisoner, center, stands on a balcony as activists remove a poster with the slogan "Freedom to Sushchenko" which hung on the facade of the UKRINFORM news agency building for almost three years, in Kyiv, Ukraine, Wednesday, Sept. 11, 2019. After more than three years of being locked up in a Russian prison Sushchenko was one of the 35 freed Ukrainian prisoners. (AP Photo/Efrem Lukatsky)

Ukrainian journalist Roman Sushchenko, former Russian prisoner, speaks during a press conference in Kyiv, Ukraine, Wednesday, Sept. 11, 2019. After more than three years of being locked up in a Russian prison Sushchenko was one of the 35 freed Ukrainian prisoners. (AP Photo/Efrem Lukatsky)

Ukrainian journalist of Ukrinform, the national news agency of Ukraine, Roman Sushchenko, speaks in Kiev on September 11, 2019, during the removing ceremony of the banner reading "Free Sushchenko" that has been hanging on the agency's building for three years. - Roman Sushchenko, 50, was Paris correspondent for Ukraine's Ukrinform national news agency. He was detained while on holiday in Moscow and last year sentenced to 12 years for espionage after he was accused of serving in Ukrainian military intelligence and gathering Russian state secrets. He has been released as part of a broader prisoner swap between Ukraine and Russia last Saturday. (Photo by Sergei SUPINSKY / AFP)

Ukrainian journalist of Ukrinform, the national news agency of Ukraine, Roman Sushchenko, speaks in Kiev on September 11, 2019, during the removing ceremony of the banner reading "Free Sushchenko" that has been hanging on the agency's building for three years. - Roman Sushchenko, 50, was Paris correspondent for Ukraine's Ukrinform national news agency. He was detained while on holiday in Moscow and last year sentenced to 12 years for espionage after he was accused of serving in Ukrainian military intelligence and gathering Russian state secrets. He has been released as part of a broader prisoner swap between Ukraine and Russia last Saturday. (Photo by Sergei SUPINSKY / AFP)

Ukrainian journalist of Ukrinform, the national news agency of Ukraine, Roman Sushchenko (C), speaks in Kiev on September 11, 2019, during the removing ceremony of the banner reading "Free Sushchenko" that has been hanging on the agency's building for three years. - Roman Sushchenko, 50, was Paris correspondent for Ukraine's Ukrinform national news agency. He was detained while on holiday in Moscow and last year sentenced to 12 years for espionage after he was accused of serving in Ukrainian military intelligence and gathering Russian state secrets. He has been released as part of a broader prisoner swap between Ukraine and Russia last Saturday. (Photo by Sergei SUPINSKY / AFP)

Ukrainian journalist of Ukrinform, the national news agency of Ukraine, Roman Sushchenko (2nd-L), speaks in Kiev on September 11, 2019, during the removing ceremony of the banner reading "Free Sushchenko" that has been hanging on the agency's building for three years. - Roman Sushchenko, 50, was Paris correspondent for Ukraine's Ukrinform national news agency. He was detained while on holiday in Moscow and last year sentenced to 12 years for espionage after he was accused of serving in Ukrainian military intelligence and gathering Russian state secrets. He has been released as part of a broader prisoner swap between Ukraine and Russia last Saturday. (Photo by Sergei SUPINSKY / AFP)

A banner depicting the Ukrainian journalist of Ukrinform, the national news agency of Ukraine, Roman Sushchenko, hangs on the agency's offices in Kiev on September 11, 2019, during its removing ceremony. - Roman Sushchenko, 50, was Paris correspondent for Ukraine's Ukrinform national news agency. He was detained while on holiday in Moscow and last year sentenced to 12 years for espionage after he was accused of serving in Ukrainian military intelligence and gathering Russian state secrets. He has been released as part of a broader prisoner swap between Ukraine and Russia last Saturday. (Photo by Sergei SUPINSKY / AFP)