Ukrainians on Monday reported that they had pushed back invading Russian forces in fierce fighting around Kyiv and in northeastern Ukraine, while the Russians moved to encircle and cut off Ukrainian forces in the east, making a diplomatic resolution to the war seem as far away as ever.

Ukrainian counterattacks around Kyiv reportedly retook more ground, with the mayor of Irpin, a fiercely contested suburb on the northwestern edge of the capital, saying that most Russian troops had retreated, though fighting continued in some districts. If Ukrainian soldiers can maintain control of Irpin, it would be strategically important to keeping their hold on Kyiv.

"Our Irpin is liberated from Moscow’s evil,” Mayor Oleksandr Markushin of Irpin posted on Telegram on Monday. But the deputy police chief, Oleksandr Bogai, offered a more skeptical account in a telephone interview, noting that fighting continued even as most Russian troops appeared to have pulled back, and that the Russians continued to shell the town.