Ukraine’s Defenses Are Dwindling. Putin Will Make the Most of It.

Mr. Menon is the author of several books on conflict and international relations.

In January, the Russian Army passed an unwanted milestone: It has been fighting in Ukraine longer than Stalin’s Red Army fought Hitler’s Wehrmacht.

When Russia’s full-scale invasion began in February 2022, few expected Ukraine to be able to hold on for long. Ukraine has done more than hold on. In the fifth year of the war, it has slowed Russian advances to a glacial pace and backed President Vladimir........

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