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Boris Johnson has said he fears Ukraine could be pressured into agreeing a "bad" peace deal with Russia that was not in its interests due to the economic consequences of the war.
"Too many countries are saying this is a European war that is unnecessary," the Prime Minister told broadcasters in the Rwandan capital Kigali, where he is attending a Commonwealth summit.
"It is an economic problem that we don't need and so the pressure will grow to encourage, coerce maybe the Ukrainians to a bad peace."
Asked who this was coming from, he said: "I think just generally, I just think there is a general sentiment.
"I think the risk is that people will fail to see that it is vital to stand up against aggression," he added. "If Putin gets away with aggression in Ukraine, if he gets away with the naked conquest of other people's territory, then the read across for every single country here is absolutely dramatic."
Follow the latest updates below.
Chernihiv comes under 'massive bombardment
Ukraine's northern border region of Chernihiv came under "massive bombardment" fired from the territory of Russia's ally Belarus, the Ukrainian army said in a statement on Saturday.
"Around 5:00 o'clock in the morning (0200 GMT) the Chernihivregion suffered a massive bombardment by missiles. Twenty rockets, fired from the territory of Belarus and from the air, targeted the village of Desna," Ukraine's northern military command wrote on Facebook, adding that there were no reports of victims so far.
Russian shelling hits chemical plant where civilians trapped, says Ukraine
Russia launched artillery and air strikes on the twin cities of Severodonetsk and Lysychansk on Saturday, hitting a chemical plant where hundreds of civilians were trapped, a Ukrainian official said.
Serhiy Gaidai, governor of the Luhansk region, said Russian forces attacked Sievierodentsk's industrial zone and also attempted to enter and blockade Lysychansk.
"There was an air strike at Lysychansk. Severodonetsk was hit by artillery," Mr Gaidai said on the Telegram messaging app, adding the Azot chemical plant in Severodonetsk and the villages of Synetsky and Pavlograd and others were shelled.
He made no mention of casualties at the Azot chemical plant and Reuters could not immediately verify the information.
Russian missiles rain down on military sites across Ukraine, local officials say
Dozens of Russian missiles rained down on military facilities in western and northern Ukraine on Saturday, local officials said, as Europe's biggest land conflict since World War Two entered its fifth month.
The governor of the Lviv region in western Ukraine, Maxim Kozytskyi, said in a video posted online that six missiles were fired from the Black Sea at the Yavoriv base, with four hitting the base and two being intercepted and destroyed before hitting their target.
Vitaliy Bunechko, governor of the Zhytomyr region in the north of the country, said strikes on a military target killed at least one soldier.
"Nearly 30 missiles were launched at one military infrastructure facility very near to the city of Zhytomyr," said Bunechko, adding that nearly 10 missiles had been intercepted and destroyed.
In the Chernihiv region, also in the north, governor Vyacheslav Chaus said the small town of Desna had come under "massed" rocket strikes on Saturday morning. Chaus did not specify what had been hit, but said there had been "infrastructure damage." There were no casualties, he added.