The opposite turned out to be true. As Russian forces have retreated around Kyiv, Ukrainian forces have gained ground in the country’s northeast and south. The southern city of Mariupol has been encircled and under siege by Russian troops for weeks, but has not been captured. Neither has another southern coastal city, Mykolaiv, also a target of Russian attacks. Dueling artillery battles have become the norm as infantry forces on both sides dig in.
But even though Russia was plagued by low morale, logistical problems and casualties, its units, for the most part, did not surrender en masse or flee.
The Russian failure boiled down to one point, analysts said: doing too much at once.
“Eventually it became clear their initial campaign was a completely unworkable military strategy,” Mr. Kofman said. “They were competing along axes of advancement, and they were basically advancing in opposite directions on the way. There was no way they were going to succeed.”
Russia’s repositioning has created, in some ways, a pause in the war. With its first phase over and the second phase just beginning, both sides are trying to prepare for each other’s next move.
“To attempt an assault in the Donbas, the Russians will need access to all the forces they’ve stuck around Kyiv,” Mr. Kofman said, a conclusion that military officials in Washington have also reached.