For years, Russia's vast size protected its deepest military and energy infrastructure from Ukraine. Not anymore. A drone strike more than 3,200 km from the front has exposed a major weakness in Putin's war strategy. Scroll down to see why Russia's geography is suddenly working against it.

'There are a lot of Ukrainian drones there': As Russia's 'untouchable' assets become Kyiv's new target, Zelensky's joke is Putin's latest nightmare

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'There are a lot of Ukrainian drones there': As Russia's 'untouchable' assets become Kyiv's new target, Zelensky's joke is Putin's latest nightmare