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KYIV, Ukraine–Ever since President Putin’s forces began massing on Ukraine’s border, the West has been obsessed with how to mount a defense of the country without provoking Russia into escalating the conflict.

That vacillation included the U.S. and European allies declining Kyiv’s requests for Patriot missile systems, tanks, and other medium- and long-range missiles to fight off the invading army. The West feared that attacks on Russian territory would create an...

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