Ukraine’s military successes against Russia have transformed calculations in Washington and other Western capitals, leading to a sharp increase in military help for Kyiv as a war that started with Western efforts at damage control has become one that offers a strategic opportunity to constrain Russia’s expansionist ambitions.

The U.S. and its allies are now shipping large volumes of heavy weaponry to Ukraine, including more advanced Western systems to supplement the light weapons and Soviet-era arms that were funneled into Ukraine since before the invasion started.

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