KYIV, Ukraine — A convoy rolls through the dense fog: soldiers on motorbikes, some perched on the roofs of cars missing doors and windows, others atop a battered truck.

Debris covers the muddy, pockmarked road, geolocated by NBC News to southern Pokrovsk — the city where fierce battles are taking place amid Russia's push to advance deeper into eastern Ukraine.

After more than a year of fighting, there are growing signs that Russia may be about to capture the city, a logistics hub seen as a gateway to the broader region.

Its forces have pierced stretched defensive lines, with Ukraine's military saying Tuesday that there were "more than 300 Russians in the city."

"In recent days, Russians have intensified their efforts to enter Pokrovsk on light vehicles through the southern suburbs,"

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