Plans for a high-stakes Trump–Putin summit aimed at ending the Ukraine conflict have hit an unexpected roadblock after Ukrainian President Volodymyr Zelenskyy invoked the country’s constitution, which mandates a national referendum before any territorial concessions can be made. As world leaders scramble for a breakthrough, the debate over the summit venue has intensified—with Hungary as Putin’s preferred location, and the UAE, Switzerland, and Rome still in contention. Watch for details
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