BRUSSELS — The European Union's former foreign policy chief faces corruption accusations alongside two other people arrested this week as part of a fraud investigation, prosecutors said Wednesday, in the latest scandal to hit the 27-nation bloc.

The arrest of Federica Mogherini, who led the EU foreign service from 2014 to 2019, risked tarnishing the EU’s international image just as it seeks to assert influence in negotiations aimed at ending the war in Ukraine. The EU has been urging Ukraine to tackle rampant corruption.

Authorities in Belgium made the arrests Tuesday after raiding the offices of the EU diplomatic service in Brussels and a college in Bruges. Ms. Mogherini now serves as the rector of the College of Europe, a prestigious institute of European studies.

The European Public

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