Brussels — NATO Secretary-General Mark Rutte brushed off fresh concern Tuesday about the United States’ commitment to the military organization on the eve of a meeting of allied foreign ministers focused on Russia’s war against Ukraine.

U.S. Secretary of State Marco Rubio will not attend Wednesday's meeting, which will unfold during high-stakes negotiations in Moscow and elsewhere in Europe on Ukraine’s future. His rare absence at the U.S.-led alliance comes after President Donald Trump’s 28-point proposal to end the almost four-year war dismayed European allies and Canada last month.

The administration's draft plan suggested that NATO would not expand further — a longtime Russian demand — and that Ukraine would not be admitted, breaking with a yearslong promise to Kyiv that it has a pl

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