Russia-Ukraine war latest news: ICC to open investigation into alleged war crimes – live

Prosecutor seeks court's approval on day dozens were killed by rockets in Kharkiv

• ICC prosecutor to investigate possible war crimes in Ukraine
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Here's a report from the Guardian's diplomatic editor, Patrick Wintour, on how the phone has become the Ukrainian president's most effective weapon.

In a string of phone calls from a besieged Kyiv, Ukraine's president, Volodymyr Zelenskiy, has persuaded the west to agree to a set of sanctions against Russia that were inconceivable a week ago.