The talks have taken place in the warring capitals of Moscow and Kyiv, from Washington and Riyadh, Saudi Arabia, to countries across Europe. Now, all eyes are finally turning to Istanbul to seek an end to Russia's 3-year-old,

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Mr. Trump then implored Ukraine to take the meeting, and President Volodymyr Zelensky said he would travel to Turkey to attend personally — challenging Mr. Putin to do the same.