Russian forces are gathering in even greater numbers near Ukraine's capital - with satellite images showing a 40 mile convoy of military vehicles near Kyiv.
A military base on the edge of the city's also been targeted with airstrike's overnight.
Moscow could be facing a war crimes investigation by the International Criminal Court.
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Prosecutors are looking into suggestions its forces appear to have used indiscriminate cluster munitions against civilian areas.
Ukraine's ambassador to the UN has shared what he says is a text message from a Russian soldier to his mother.
Sergiy Kyslytsya says it was sent just before he was killed:
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