The meeting between superpower presidents was cordial and careful, but it will take far more than a video call to smooth such frosty relations. Europe once had an enviable international rail network—one it must revive if the bloc is to meet its climate targets. And the costly and sometimes dangerous lengths South Koreans are going to for flattering photographs.For full access to print, digital and audio editions of The Economist, subscribe here www.economist.com/intelligenceoffer
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