Quality and quantity have proved more or less effective. Small, mobile units gave Ukrainian forces the advantage during Russia’s plodding assault on Kyiv. Those small Ukrainian units were able to assault miles-long Russian armored convoys almost with impunity, in the end repelling what was intended to be the decisive force of the Russian invasion within days of the start of the war. “As a Marine infantryman—stalkers and hunters—clearly, the Ukrainians have done that in spades,” John Kelly, retired US Marine Corps general and former chief of staff in the Trump White House, told me. “The beauty
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