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."
An explosive-laden car rammed into a Pakistani military convoy on Saturday in a town near the Afghan border, killing at least 13 soldiers, sources said.
Radiation levels in the Gulf region remain normal after the 12-day Israel-Iran conflict severely damaged several nuclear facilities in Iran, Director General Rafael Mariano Grossi of the International Atomic Energy Agency (IAEA) said.
Rwanda and Democratic Republic of Congo signed a US-brokered peace agreement on Friday, raising hopes for an end to fighting that has killed thousands and displaced hundreds of thousands more this year.
The US Supreme Court on the last day of rulings for its current term gave Donald Trump his latest in a series of victories at the nation's top judicial body, one that may make it easier for him to implement contentious elements of his sweeping agenda as he tests the limits of presidential power.
Polish President Andrzej Duda arrived in Kyiv on Saturday for a meeting with Ukrainian President Volodymyr Zelenskyy, Duda's office said, as Kyiv aims to build support among allies at a critical juncture in its grinding war with Russia.