To an outsider, it may seem an unlikely time for Ukraine to double down on the battle against corruption, as missiles rain down on cities and citizens fight for their lives.

Nonetheless, anti-graft agencies have revived a years-old investigation into an official scheme they say led to electricity customers overpaying by more than $1 billion, plus a case that stalled in 2020 into the alleged theft of over $350 million in assets and funds from a state-controlled oil company.

They've launched new actions too, including this month the arrest in absentia of an ex-state bank boss over his suspected role in the embezzlement of $5 million. He denies wrongdoing.