Stiffer than expected Ukrainian resistance and Russia's own logistical missteps have bogged down Russia's advance, US and Western officials say, sparking a fragile optimism. The US has also continued sharing downgraded intelligence with the Ukrainians, including about Russian military moves, in an attempt to help Ukraine on the battlefield, two of the sources told CNN.
But intelligence and defense officials closely tracking the Russian campaign say Putin still holds a number of moves in reserve that could devastate the Ukrainian resistance.
"From a purely military/tactical standpoint, Russia has the manpower and firepower to take Kyiv. No question," said an American source familiar with the intelligence. "And no matter how much resistance the Ukrainians put up."
Roughly a quarter of Russia's amassed troops have yet to enter Ukraine, a senior defense official told reporters on Monday — a potential "second wave," according to two sources familiar with the intelligence — and defense officials say Putin could yet order a far less restrained bombing campaign, including airstrikes, long-range missiles and artillery.
"They have been slowed and they have been frustrated by their lack of progress on Kyiv, and one of the things that could result is a reevaluation of their tactics and the potential for them to be more aggressive and more overt in both the size and the scale of their targeting of Kyiv," a senior defense official told reporters on Monday.