President Biden has taken every opportunity over the past 16 months to celebrate NATO's unity on Ukraine.But on one key topic, Mr. Biden finds himself somewhat isolated within the alliance: when and how Kyiv would join.Mr. Biden, who has been cautious about getting NATO into a direct fight with Moscow, has sought to maintain the status quo of more than a decade: a vague promise that Ukraine, now arguably the most powerful military force in Europe, will eventually join the alliance, but with no set timetable.
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