Sick children fleeing conflict in Ukraine will be given medical care in the UK, the country has announced.

The UK will provide cancer treatment for 21 seriously ill Ukrainian children as Brits were urged to open their homes to people fleeing war.

The children and their immediate family members arrived from Poland on Sunday evening and will be assessed before being sent to NHS hospitals to continue their care.

Announcing their arrival, Health Secretary Sajid Javid said: “I am proud that the UK is offering lifesaving medical care to these Ukrainian children, who have been forced out of their home country by the Russian invasion while undergoing medical treatment.”

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The children’s arrival came after a Russian attack on a military training base near Yavoriv in western Ukraine, less than 15 miles (24km) from the border with Poland, a Nato member.

During a call with Ukrainian president Volodymyr Zelensky on Sunday, Mr Johnson “said the UK would continue to pursue more options for bolstering Ukraine’s self-defence, working with partners including at Tuesday’s meeting of the Joint Expeditionary Force (JEF) in London”, a No 10 spokesman said.

Mr Johnson said Russian president Vladimir Putin’s “barbaric actions” were “testing not just Ukraine but all of humanity”.

People keen to offer refugees shelter in the UK can register their interest in sponsoring Ukrainians through the Government’s new humanitarian scheme from Monday.

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Levelling Up Secretary Michael Gove has said the process of matching Britons with people fleeing the conflict will take place from Friday, while he expects the first refugees to use the new route will make their way to the UK by the end of the week.

Meanwhile, the UK will supply Ukraine with more than 500 portable generators to provide energy for essential services, including at hospitals and shelters.

Mr Johnson said they will help ease the power cuts currently crippling the country.