Ukraine's prime minister said that the country is "absolutely sure" that it will defeat Russia's invading forces in a "short period" after Boris Johnson said that it remains a "realistic possibility" for Russia to win.
Russia has launched what is seen as a second phase of its invasion of the Donbas region in the east of Ukraine after pulling back from its attack on the north which began on February 24.
And a Russian general said on Friday that Moscow wants to take full control over southern Ukraine, which the Ukrainian government says shows that Russia's previous assertions, that it had no territorial ambitions, was a lie.