The International Criminal Court’s top prosecutor was in Ukraine to investigate Russia’s campaign of missile and drone attacks on power and other infrastructure that killed hundreds of civilians and left millions with no electricity or water.

“Generally we see clearly a pattern, I think, in terms of the number, scale and breadth of attacks against the power grids of Ukraine and we need to look at why that’s taking place; are they legitimate targets or not?, - ICC Prosecutor Karim Khan said.

He was speaking to a small group of reporters in front of a badly damaged apartment block in the satellite town of Vyshhorod just north of Kyiv, where a Russian missile fell in late November killing 8 civilians and wounding many more. It was not clear whether the missile was aimed at a power installation nearby and missed its target.

“We need to find out what pattern, if any, is demonstrated by that because these are not isolated occurrences”.

More than 70,000 alleged war crimes have been reported, the vast majority of which would be dealt with in domestic courts.