Ukrainian president Volodymyr Zelensky has said he told the G7 leaders gathered in Canada that "diplomacy is now in a state of crisis" after the US president Donald Trump left the summit a day early to address the conflict in the Middle East.

While Russia’s high casualties and the attritional nature of the Ukraine war draw comparisons to its collapse in World War I, a similar outcome is unlikely. -In 1918, a demoralized army and revolution at home forced Russia out of the war.