IRPIN, UKRAINE - APRIL 18: Destroyed structures stand on April 18, 2022 in Irpin, Ukraine. The Kyiv suburb was heavily damaged in fighting between invading Russian forces and Ukrainian troops weeks before. (Photo by John Moore/Getty Images)

KRAMATORSK, Ukraine (AP) — Russian troops pushed farther into a key eastern Ukrainian city and fought street by street with Kyiv’s forces Monday. The mayor said the battle has left the city in ruins and driven tens of thousands from their homes. Military analysts painted the fight for Sievierodonetsk as part of a race against time for the Kremlin. The city is key to Russian efforts to complete the capture of the eastern industrial region of the Donbas quickly — before more Western arms arrive to bolster Ukraine’s defense. Weapons from the West have already helped Kyiv’s forces thwart a Russian advance on the capital in the early weeks of the war. That failure forced Moscow to withdraw, regroup, and pursue a more limited objective of seizing the Donbas.