Ukrainian drones have not only embarrassed Putin by spoiling his celebrations this year but also and more importantly called into question the long-standing assumption that Russia’s enormous size is an asset that represents “the ultimate guarantee of the state’s invulnerability,” Sergey Medvedev says.

In fact, the Radio Liberty commentator says, as the drone attacks have highlighted, “Russia’s immense territorial bulk … is transforming from an asset into a liability [because] it is virtually impossible to shield or defend” all of it........

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