PARIS — French President Macron late Tuesday appointed Defense Minister Sébastien Lecornu as France’s new prime minister, the country’s fourth in about a year. Lecornu, 39, is the youngest defense minister in French history and architect of a major military buildup through 2030, spurred by Russia’s war in Ukraine. A former conservative who joined Macron’s centrist movement in 2017, he has held posts in local governments, overseas territories and during Macron’s yellow vest “gre

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