Ousted defence chief Mykhailo Fedorov, whose reforms riled Ukraine's army bosses

Ukraine's ousted defence minister Mykhailo Fedorov served just six months before his ambitious drive to reform the military led to irreconcilable clashes with the country's top brass, which he viewed as out of date, inflexible and mired in bureaucracy.

Fedorov's early bet on drone warfare was a game-changer as Ukraine faced off against a more formidable opponent. ...