BRUSSELS — Top EU diplomat Kaja Kallas called allegations of fraud against her predecessor Federica Mogherini and a senior EU official “deeply shocking” in a letter to staff, as she sought to distance herself from the scandal. The internal letter, sent to European External Action Service (EEAS) staff on Wednesday and seen by POLITICO, stated that the events in question “took place under previous mandates” at the bloc’s foreign policy arm. Kallas took over from Josep Borrell as the EU’s High