Kiev, Ukraine

As befits a head of state managing a war, Ukrainian President Petro Poroshenko is blunt in an interview Monday evening at the presidential-administration building here. Asked about the kind of weapons his armed forces would need to deter further aggression by Russia and its separatist proxies in eastern Ukraine, Mr. Poroshenko gets specific: “We’re looking for just 1,240 Javelin missiles, and this is absolutely fair.”

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