• Volodymyr Zelenskyy said that speed restrictions on Ukraine's Starlink connection have been lifted.
• His comments marked the end of a chaotic 10-day period where connection speeds were throttled.
• Ukraine uses Starlink to fly its drones and interceptors.

Ukraine President Volodymyr Zelenskyy said on Saturday that his military's access to a network of Elon Musk's satellites, which it relies on for defense, had been restored.

Zelenskyy's comment, made in an X post, came after a chaotic 10 days that began when an advisor to the Ukrainian president said that drones and other projectiles were losing access to the Starshield network.

Starshield is the military application of Musk's Starlink satellite network. In the no-man's-land of war-torn eastern Ukraine, the Ukrainian military relies on Starshield satellites to give it control of fast-flying, exploding drones and interceptors.

"I thank all Americans and all our partners who took this seriously and truly helped — members of Congress, senators, all the media, the State Department, and the President," Zelenskyy said in a video he posted to X on Saturday.

Though Musk, as the CEO of SpaceX, to some degree owns the network of satellites, he said in an X post that "any limits on speed or usage are decided by the US military and ultimately POTUS."

In an X post on Saturday, Musk differentiated between Starlink, which is used for commercial purposes, and Starshield, which is "controlled by the US government," he said.

"Ukraine military violated Starlink terms of service and used it for offensive drone strikes to kill people," Musk said. "That loophole was closed last week."

The Wall Street Journal reported that Musk himself had ordered the slowdown. Earlier this month, after Ukraine targeted Russian oil facilities, both Musk and President Donald Trump made statements disparaging Zelenskyy. Trump has tried to ease high gas prices — which spiked after the US attacked Iran in February — by loosening sanctions on Russian energy.

"Zelensky has gone too far," Musk said in an X post on October 10.

For his part, Trump told reporters that he didn't know who ordered the slowdown. "I don't know who it was, but I'd like to find out," he said on October 19.

As Russia attempts to bombard Kyiv into submission ahead of what is widely expected to be one of the most brutal winters of the nearly seven-year-long war, a Starlink connection allows Ukraine to intercept some of Russia's slower-paced drones.

The throttling of Starlink prompted a rare outburst from Ukraine's leader, who has sought to control his demeanor after a disastrous Oval Office meeting last year, when Trump berated Zelenskyy for not adequately appreciating US support.

In an interview with Piers Morgan on his YouTube channel on October 14, Zelenskyy called the Starlink slowdown "a big mistake."

"This decision will bring a lot of human losses," he said.

SpaceX and the White House did not immediately respond to requests for comment sent on Saturday.

This autumn, as Russia escalated its total-war-style strike campaign against Ukraine’s critical infrastructure and economy, and relations between Kyiv and Washington hit an all-time low, the daily battles along Ukraine’s vast battlefield have faded into the background of the information space.

Despite the reduced attention in

Ukraine's Defense Forces advanced more than 15 km through underground utility tunnels into Russia's rear on the Kupiansk axis in Kharkiv Oblast, the Khartiia Corps of Ukraine's National Guard reported on 22 October. The corps called it Operation Veles. The underground advance was paired with attacks on the surface and drone strikes, hitting Russian forces from two directions, the corps told Militarnyi.

Russian troops have repeatedly crawled through gas pipelines around Kupiansk to get behind Ukrainian lines, even after Ukraine reported confident control of the city in February. This time, Ukraine went underground itself. The operation took away Russia's chance to get into Kupiansk's rear, the corps said.

The corps reported more than 30 Russian soldiers captured and Russian losses of more than 100. Militarnyi, citing the unit, put the number of Russian troops killed at over 100.

Khartiia studied how Russian troops moved through pipes before going underground itself, the corps commander, Brigadier General Ihor Obolenskyi, said.

"We watched how the enemy works underground and studied how they do it. The Russians intended to use gas pipelines to get into the rear of our troops. So we went underground ourselves. We anticipated the enemy's actions and mastered the tactics of underground combat," he said.

For the operation, troops trained physically and psychologically to fight in confined spaces, sappers and engineers prepared the underground route, and special communications, navigation, silent logistics, and life-support systems were put in place, Khartiia told Militarnyi. The operation was named after Veles, the Slavic pagan god of the underworld.

Khartiia's brigade, the R.U.H. assault regiment, the Lava drone regiment, the Achilles drone brigade, and units of Ukraine's military intelligence, including the Freedom of Russia Legion and the Russian Volunteer Corps, took part, the corps said.

Russia has used pipelines to infiltrate before

By September 2025, Russian forces had used pipelines to move troops behind Ukrainian lines three times, Ukrainian monitoring project DeepState reported on 12 September 2025. The first was in Avdiivka, the second near Sudzha, and the third near Kupiansk, where groups crossed the Oskil River through a gas pipe.

Near Sudzha in March 2025, Russian special forces walked through a pipeline that until recently had carried Russian gas to Europe, the Associated Press reported. A pro-Kremlin blogger claimed they covered about 15 km and that some spent several days inside.

Russian troops kept using the pipeline near Kupiansk this year. On 27 September, Khartiia's reconnaissance drones recorded Russian forces leading nine civilians, including children, elderly people, and a person on crutches, through the gas pipeline out of the Kupiansk community. Men of military age in civilian clothes walked alongside them, and the corps believes they were Russian soldiers using the group as cover to withdraw. Ukrainian troops held fire because of the civilians, the corps said, adding that the case has been documented for a war crimes investigation.

Why the war is moving underground

Drones, constant surveillance, and AI-assisted targeting have made the battlefield surface transparent and deadly, argue John Spencer, chair of urban warfare studies at West Point's Modern War Institute, and Col. Drew Craig, principal military engineering staff officer at NATO's Allied Rapid Reaction Corps. In an August analysis, they write that soldiers in Ukraine describe a "death zone" of some 30 km, where moving above ground can draw an attack within minutes. When firepower makes the surface too dangerous, armies have historically gone underground, as they did in World War I and Vietnam, and more recently in Gaza and Lebanon.

"Armies that cannot survive above ground must adapt below it," the authors write.

Fighting in tunnels brings its own requirements, the authors write: detecting the enemy by sound and vibration, and specialized unmanned systems that cannot rely on GPS or stable radio links. Long stretches underground also take a severe psychological and physical toll on soldiers.

Western militaries are not ready for this, Spencer and Craig write. No NATO partner maintains even general capabilities for large-scale underground warfare, and US and British efforts focused mainly on detecting and clearing tunnels rather than occupying and operating in them.

Editor's note: Most of the Ukrainian soldiers and commanders interviewed are identified by their callsigns, in accordance with military protocols.

KHARKIV OBLAST — Ukrainian soldier Oleksandr had already narrowly survived crossing a mine-strewn field and a river in the crosshairs of Russian artillery when the swarm of first-person-view

Ukrainian infantry encircled and retook the village of Kolodiazi north of Lyman without getting drawn into street fighting, while a drone battalion kept the sky above them shut, the battalion’s chief of staff told Suspilne on 18 October. The village fell during the fourth and final phase of Operation Vivaldi, Ukraine’s counteroffensive in northern Donetsk Oblast.

For years now, Russia has aimed to seize Lyman and cross the Siverskyi Donets River. It needs this area to encircle Ukraine’s fortress belt of Donetsk Oblast cities from the northwest, ISW assesses. Vivaldi’s four phases retook 277 km² and 16 settlements on that approach, and a veteran of the operation has said Ukraine’s assault troops suffered more than ten times fewer casualties than Russian forces doing it.

Drones over the infantry

The 60th Mechanized Brigade fought in all four phases of Vivaldi and took Kolodiazi in the last one, said the chief of staff of the brigade’s Fatum unmanned systems battalion, callsign Krash.

“Our task, as an unmanned systems battalion, was to escort and ‘close’ the air in front of our infantry to make it impossible for the enemy to hit it. To suppress all the firing assets possible,” he said.

The brigade’s 3rd Mechanized Battalion, the main striking force, encircled Kolodiazi and retook it without getting drawn into street fighting, Krash said. The 1st Mechanized Battalion kept Russian reinforcements out of the area, while drone crews suppressed artillery, hit supply runs, and worked against Russian drone operators.

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Vivaldi counteroffensive advanced after Ukraine took Russia’s drones out of the fight, ISW assesses

500 troops and 200-plus vehicles

The drone battalion killed or wounded about 500 Russian troops during the fourth phase and struck Russian armored vehicles, trucks, and motorbikes, its chief of staff said.

“More than two hundred pieces of various equipment: Grad and Uragan multiple rocket launchers, various armored vehicles, tanks, armored combat vehicles. Most of all motorbikes and quad bikes, there the count runs into the hundreds. This is our enemy’s main logistics tool,” he said.

Ghost villages

The villages retaken in northern Donetsk Oblast are nearly empty of civilians, Krash said.

“It’s very typical for de-occupied settlements: these are ghost towns. You can see right away where the occupier stepped. All the settlements are under the control of the Third Army Corps, our forces stand there and prevent enemy infiltration. But civilian life in these towns is either absent or very scarce,” he said.

Third Army Corps commander Brigadier General Andrii Biletskyi reported Kolodiazi’s liberation, along with Zelena Dolyna and Lypove, when he summed up Vivaldi’s fourth phase, which secured 101 km².