Ukraine does not know what format the U.S. will use to negotiate with Russia in Riyadh, Foreign Ministry spokesperson Heorhii Tykhyi said.

Most of the Russian prisoners of war were subjected to systemic torture and testify to an extensive network of "secret prisons", which are also located on the territory of the Kursk region. This is stated in a report published on the website of the Russian Foreign Ministry.

Turkish Foreign Minister Hakan Fidan on Friday expressed Ankara's support for the US-led peace negotiations to end the three-year Russia-Ukraine war. "We support the ceasefire talks led by the US," Fidan said at a joint news conference with his Hungarian counterpart in the capital Ankara.