Ukrainian presidential adviser and peace talks negotiator Mykhailo Podolyak said on Saturday that any agreement with Russia cannot be trusted, and Moscow can only be stopped in its invasion by force.
"Any agreement with Russia isn't worth a broken penny, Podolyak wrote on the Telegram messaging app. "Is it possible to negotiate with a country that always lies cynically and propagandistically?"
Russia and Ukraine have blamed each other after peace talks stalled, with the last known face-to-face negotiations on March 29. The Kremlin said earlier this month Ukraine was showing no willingness to continue peace talks, while officials in Kyiv blamed Russia for the lack of progress.
On Monday, Ukrainian President Volodymyr Zelensky said that President Vladimir Putin was the only Russian official he was willing to meet with to discuss how to end the war.
Putin says Russian forces are on a special operation to demilitarise Ukraine and rid it of radical anti-Russian nationalists. Ukraine and its allies call that a false pretext to invade Ukraine on February 24.
"Russia has proved that it is a barbarian country that threatens world security," Podolyak said. "A barbarian can only be stopped by force."
Israel is demanding the release of all 50 hostages held in Gaza, Israeli public broadcaster Kan cited the prime minister's office as saying on Tuesday, as talks on a proposed deal envisaging a 60-day truce and release of half the hostages continue.
U.S. President Donald Trump said on Tuesday he hoped Vladimir Putin was going to "be good" and move forward toward ending the war in Ukraine, but conceded it was possible the Russian president doesn't want to make a deal.
Aid worker killings rose nearly a third to almost 400 last year, the most deadly year since records began in 1997, and the conflict in Gaza is continuing to cause high death rates for humanitarian staff in 2025, U.N. and other data showed.
Israel is studying Hamas' response to a Gaza ceasefire proposal, two officials said on Tuesday of a potential deal for a 60-day truce and the release of half the Israeli hostages still held in the battered enclave.
US President Donald Trump has told Volodymyr Zelenskyy that the US would help guarantee Ukraine's security in any deal to end Russia's war there, though the extent of any assistance was not immediately clear.