Both sides have missiles and have been hesitant to use their air force.
Russia is reportedly low on skilled pilots and missiles for their jets as well, so hasn't been using them much.
As night fell on Ukraine on Tuesday, Russia's large convoy was still about 18 miles north of Kyiv — representing little or no change from Monday, the official said. The official added that some elements within the military column are "literally out of gas" and having difficulty feeding their troops.
"The U.S. says about 80% of the estimated 190,000 Russian troops that rimmed Ukraine are now in the country," NPR Pentagon correspondent Tom Bowman reports. "About 400 missiles have been fired by the Russians since the invasion began last week."
The official told reporters it's possible that the Russians are now regrouping and their leaders are rethinking their invasion strategy. Since the war began last week, Ukraine's military — and its regular citizens — have repeatedly shown a willingness to engage with the Russian force.
Despite Russia's vastly larger armed forces, Ukraine's airspace remains contested, with President Volodymyr Zelenskyy's country currently mounting a viable defense, the senior defense official said.
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Holy fuck! Such ineptitude - even by Russian standards!
Somewhere - in a place where bad men go when they die - Feldmarschall Erich Von Manstein is looking at that stalled column on a big-screen. He's no longer face-palming. Now he's just gaping open-mouthed in shock and disgusted incredulity at the incompetent generalship.
Across the table, George Patton twirls his pearl-handled revolver and says "A goddam platoon of my Sherman tanks would take out that entire mishandled column in 30 minutes!... Whaddya say, Zhukov?!"
And Zhukov just looks at the screen and spits.