Ukrainian President Volodymyr Zelensky's chief of staff, has resigned following an anti-corruption raid on his home

Andriy Yermak has been Zelensky's closest adviser throughout Ukraine's war with Russia.

This comes as Russia's President Vladimir Putin renews threats to seize more Ukrainian territory, unless Kyiv withdraws troops.

Sky News Defence and Security Editor Deborah Haynes says Yermak has not yet been accused of any offence, as a major corruption probe's emerges.

She says there's concern over a plot at the state energy company - involving kick-backs and laundered money.