GENEVA—U.S. President Donald Trump participated in a series of high-level meetings on June 16, the first full day of the summit of the G7 group of leading industrial nations in Évian-les-Bains, a lakeside town in eastern France. He joined a roundtable discussion with Ukrainian President Volodymyr Zelenskyy and held bilateral meetings with the leaders of Qatar and the United Arab Emirates to discuss the Iran deal and the situation in the Middle East. The day’s program concluded with a cultural performance and a social dinner. Here are key takeaways from the first day of the summit, which focused on Iran and Ukraine....