Russia, frustrated by early battlefield setbacks in Ukraine, could be shifting its strategy to siege warfare just as President Vladimir Putin raises the risk of a catastrophic miscalculation by putting nuclear forces on heightened alert, a senior U.S. defense official said on Sunday.
Putin gave the order to his nuclear forces as Washington assesses that Russian troops have made limited progress in their four-day-old invasion due to stiff Ukrainian resistance and planning failures that have left some units without fuel or other supplies, U.S. officials said.
"It appears that they are adopting a siege mentality, which any student of military tactics and strategy will tell you, when you adopt siege tactics, it increases the likelihood of collateral damage," the official said. The senior U.S. defense official said it remained to be seen what Russian forces would do next, but the early signs were worrying.
Images on social media showed some Russian military vehicles in Ukraine, including battle tanks, that had apparently been abandoned after running out of fuel, raising questions about logistical failures. Russia has still not moved into Ukraine about a third of the troops that Putin had arrayed around its borders, the official said. But it has rapidly increased the number of forces Moscow has sent into Ukraine in recent days.The Pentagon learned of the heightened Russian alert for its nuclear forces from Putin's televised announcement, the senior U.S. defense official said, instead of from American intelligence sources.
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