Footage geolocated by Sky News showed Russian soldiers walking through the Shakhtarskyi neighbourhood on the outskirts of Pokrovsk on Thursday.
The video sheds light on the situation in this key frontline area, as Russian forces slowly encroach on Myrnohrad, the satellite town to Pokrovsk, and one of its last remaining outposts.
Videos geolocated by Sky News show fighting intensifying in recent weeks, as Russian forces attempt to gain control of the towns and their network of road and rail intersections.
Gaining control here would give Russia a base from which to access key cities further north that form part of Ukraine's "fortress belt".
Russian forces are advancing from all directions, according to the Institute for the Study of War (ISW), with only one small opening to the northwest of Myrnohrad remaining.
Estimated to be only 3km wide by military experts, this withdrawal corridor is patrolled by Russian drone units which monitor the area for moving vehicles and those who may attempt to leave on foot.
Russian forces have been advancing on Myrnohrad since late October.
Video from a Ukrainian unit in Myrnohad, posted on 29 October, shows a Russian vehicle attempting to enter the town from the northeast. The tank is attacked and soldiers attempting to enter on foot are targeted.
Video posted on 3 November shows Russian forces on the ground in the south of the town.
By 8 November, Russian strikes begin to pummel the northeast of Myrnohrad, the location of many of the town's high-rise buildings, at that time, held by Ukrainian forces.
George Barros, Russia Team & Geospatial Intelligence Team Lead at ISW, told Sky News that Russian strategy in Pokrovsk has been to erode Ukrainian logistical capacity using drones and artillery over the course of several months.
"After denying supply lines and degrading the frontline forces by essentially cutting them off from behind and starving them out in their positions, then the Russians move forward with their infantry and frontal assaults," Barros explained.
Capture the flag
For a brief period, it looked as though Russian forces had captured Myrnohrad.
Videos posted on 13 November appeared to show a Russian flag flying over the Myrnohrad mine.
However, video posted the following day showed a Ukrainian drone shooting it down.
Both Russian and Ukrainian forces continue to fight for control of Myrnohrad, with videos posted on the 19 and 20 November showing Russian airstrikes on Ukrainian positions in the town, and Ukrainian drone strikes targeting Russian forces on foot.
While the exact numbers of Russian and Ukrainian forces in the area remains unclear, reports indicate that three key Russian units are active in Pokrovsk and Myrnohrad, and are advancing on the towns from the north and south.
A number of Ukrainian units remain inside the towns, including the 145th Assault regiment and the 32nd, 35th, 38th and 155th Brigades. Reports indicate that more Ukrainian units have been moved into surrounding areas to hold the withdrawal corridor open.
Sky News reached out to the Ukrainian brigades still in Myrnohrad, but they declined to comment, citing military regulations.
Strategic significance
Natia Seskuria, associate international security fellow at the Royal United Services Institute (RUSI), explained that the area is important for the Ukrainians to keep and the Russians to take because of its strategic position.
"Situated at a major road and rail intersection in Donetsk Oblast, Pokrovsk has functioned as a central artery for moving troops, equipment, and supplies to Ukrainian units deployed along the surrounding front."
Russia "would gain a platform to redirect its offensive efforts toward Ukraine's principal defensive urban centres... including Kramatorsk and Slovyansk," Seskuria said.
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Ukrainian and Russian soldiers in Pokrovsk have fought intensely and at close quarters over the last month.
In late October US-made Black Hawk helicopters containing specialist troops directed by Ukrainian military intelligence entered Pokrovsk to try to keep the town.
But as Russian troops advance, Myrnohrad is becoming the last stronghold of Ukrainian forces in the area.
Uncertain future
At least up until 12 November, there were still civilians living in Pokrovsk and Myrnohrad, despite strikes on buildings in both cities.
A post made on that day by the Donetsk state regional administration estimated 1,200 people remain living in Pokrovsk and 900 in Myrnohrad.
Evacuation is only possible with the help of the military or police, and it is not clear how many have evacuated in the 11 days since.
Barros of ISW says gaining Pokrovsk would increase Russia's leverage at the negotiating table.
"If the Russians can successfully convince enough international leaders that, okay, the Russians took Pokrovsk, they're going to take the next thing, and they're going take the thing, so now let's negotiate, then that is a strategic victory for the Russians."
Production by Michelle Inez Simon, Visual Investigations Producer.
The Data x Forensics team is a multi-skilled unit dedicated to providing transparent journalism from Sky News. We gather, analyse and visualise data to tell data-driven stories. We combine traditional reporting skills with advanced analysis of satellite images, social media and other open source information. Through multimedia storytelling we aim to better explain the world while also showing how our journalism is done.
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