CHASIV YAR, Ukraine — Russian troops and mercenaries rained artillery on the last access routes to the besieged Ukrainian city of Bakhmut on Friday, bringing Moscow closer to its first major victory in half a year after the bloodiest fighting of the war.

The head of Russia's Wagner private army said the city, which has been blasted to ruins in Russia's more than seven month onslaught, was almost completely surrounded with only one road still open for Ukraine's troops.