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."
The Pentagon is working on plans to deploy the US military to Chicago as President Donald Trump says he is cracking down on crime, homelessness and undocumented immigration, the Washington Post reported on Saturday.
Thousands of Australians joined pro-Palestinian rallies on Sunday, organisers said, amid strained relations between Israel and Australia following the centre-left government's decision to recognise a Palestinian state.
Portugal's authorities have said that between July 27 and August 15, 1,331 excess deaths from extreme heat were reported, with the over 75 age group particularly hard hit, Euronews reported on Saturday.
A tour bus carrying more than 50 people veered out of control and rolled over on an Upstate New York highway on Friday, killing at least five people and injuring dozens of others, authorities said.
Foreign ministers from European countries, Australia and Britain on Friday jointly condemned Israel's plans to construct a settlement east of Jerusalem.