Russia-Ukraine war live: Biden pledges to boost Ukraine’s air defence; EU and G7 leaders to meet to agree on more Russia sanctions

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• Ukraine calls for Patriot missiles to defend its grid and stop rise in refugees

A dispatch here from reporters working for Agence France-Presse in Bulgaria, as Russians in the seaside resort of Varna help Ukrainian refugees.

When Ukrainian Elena Bondarenko fled to Bulgaria after Russia invaded, she never imagined she would be taken in by a Russian there.

But that is exactly what happened to the bank clerk from Zaporizhzhia, one of many refugees fleeing the war who have been quietly sheltered by members of the country's 17,500-strong Russian community.

We are doing everything to ensure that no strings are available to be pulled by the aggressor state that could make Ukrainian society suffer."