Andrew Radin

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Ukrainian soldiers ride through the town of Trostsyanets, about 250 miles east of Ukraine's capital, Kyiv, on Monday. (Efrem Lukatsky/AP)

Over the past weeks, the Ukrainian military has waged a surprisingly tough resistance against a much larger and more capable Russian army. While it’s too early for a full accounting, Ukraine’s performance appears to be exceeding expectations.

But seven years ago, Ukraine’s military was unprepared and largely ineffective when Russia’s military seized Crimea. By 2022, Ukraine appears to have overcome at least some of the earlier challenges.

Did U.S. security assistance — roughly $2 billion between 2014 and 2020 — make the Ukrainian military more effective? Our research points to one explanation for why U.S. security assistance may have had greater success in Ukraine.…  Seguir leyendo »