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.”
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.
Representatives from Denmark, Finland, Estonia, Iceland, Latvia, Lithuania, the Netherlands, Sweden and Norway will attend the summit of the northern European security coalition.
During this week’s JEF summit in London, he will urge leaders to work together to ensure no further nations fall victim to Mr Putin’s aggression, No 10 said.
Mr Johnson will host the group for dinner at his official country residence, Chequers, on Monday night.
The coalition will then meet in London on Tuesday, before the Prime Minister is joined by the leaders of Finland and Sweden at Downing Street in the afternoon.
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.