When a country has had to attack one of its own airports, seen a chunk of territory seized by a neighbour and watched armed insurgents overrun another portion, it might seem odd to argue that restoring peace is not its leader's hardest challenge. But Petro Poroshenko, Ukraine's new president, faces an even bigger task: to dismantle the corrupt, oligarchic system of government that helped create Ukraine's turmoil-a system in which Mr Poroshenko himself participated.
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