Censor.NET reports referring to lawyer Ilya Novikov's Twitter page.
"Nadiia Savchenko has arrived in Moscow to attend the hearing of Karpiuk and Klykh's appeal by the Supreme Court," he wrote.
Photo by Ilya Novikov
The information has also been confirmed by Radio Svoboda journalist Anton Naumlyuk.
UNIAN correspondent Roman Tsymbaliuk wrote on Facebook: "Just imagine who I've met in Moscow! Nadiia Savchenko has come to support our prisoners Mykola Karpiuk and Stanislav Klykh in the Supreme Court of the Russian Federation. She has given a lot of interesting comments about Ukrainian media in Moscow!"
"We have to fight for the liberation of all Ukrainian prisoners. Whatever they may do and say after returning home," Tsymbaliuk added.
Photos by Roman Tsymbaliuk
As reported by journalist Yana Goncharova, political prisoners Mykola Karpiuk and Stanislav Klykh could not attend the hearing in person.
"Karpiuk and Klykh are present via videolink, Nadiia Savchenko is here. Karpiuk is cheerful, Klykh looks fine and is said to have gained a few kilos," she wrote.
Photos by Yana Goncharova
Earlier, the court of Grozny (Russia) convicted two citizens of Ukraine May 19. Chechnya's Supreme Court sentenced Karpiuk to 22 years and six months in a high-security prison and Klykh to 20 years in prison May 26. The Supreme Court of the Chechen Republic of the Russian Federation dismissed the appeal of Ukrainians Mykola Karpiuk and Stanislav Klykh against their confinement June 14.
Feb. 17, 2016, Russian Human Rights Center Memorial recognized citizens of Ukraine Mykola Karpiuk and Stanislav Klykh political prisoners whom Russia was unlawfully holding in prison. According to human rights activists, the indictment in this case was made with violations and described nonexistent crimes.
Related materials: Ukrainian hostages in Russia