A Ukrainian soldier covering his ear amid artillery fire in the Donetsk region, Ukraine, December 2023
Inna Varenytsia / Reuters

One of the chief justifications for sending military aid to Ukraine turns on deterrence. Proponents of Western support contend that it is essential for showcasing resolve. The United States and its allies, the argument runs, need to demonstrate to the world, and especially to Chinese President Xi Jinping, that they are willing to put muscle and resources behind efforts to combat unchecked aggression. But a growing chorus of voices argue that continued support to Ukraine is detracting from the real threat—namely, a Chinese invasion of Taiwan. All this assistance, they claim, is depleting valuable resources needed to deter an

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