What SpaceX's Starshield is, and how it differs from Starlink

Ukraine's military began losing satellite links on fast-moving drones around Oct. 13–14, when terminals started dropping their connection above about 160 km/h (100 mph), Ukrainian officials told the BBC. The service involved is Starshield, a SpaceX product line that rarely makes headlines.

Starlink is SpaceX's commercial satellite-internet service. Starshield, according to SpaceX, "leverages SpaceX's Starlink technology and launch capability" for government and national-security users, with dedicated satellites and extra encryption. Neither SpaceX nor the Pentagon has publicly explained how Ukraine's speed limit works or why it was imposed.

What Starshield is

"While Starlink is designed for consumer and commercial use, Starshield is designed for government use," SpaceX says on its Starshield page. The company lists three initial focus areas: Earth observation, communications and hosted payloads, meaning customer instruments flown on SpaceX-built satellite buses (the core spacecraft body that provides power, propulsion and communications for the payload).

For communications, SpaceX says Starshield provides "assured global communications to government users with Starshield user equipment." It says Starlink already encrypts user data end to end, while Starshield adds "additional high-assurance cryptographic capability to host classified payloads and process data securely." Those are SpaceX's own descriptions, and it publishes few technical details.

The name covers two kinds of systems. Reuters, in an Oct. 15 report published by CNBC, said Starshield "uses the Starlink constellation as its backbone" and that "the Pentagon is the biggest customer of Starshield." The Pentagon has also bought dedicated Starshield satellites, including missile-warning communications spacecraft, Reuters reported.

The best-known dedicated program is classified. In 2024, Reuters reported, citing five sources, that Starshield was building "a network of hundreds of spy satellites" for the National Reconnaissance Office (NRO) under a $1.8 billion contract signed in 2021. That network is separate from Starlink, Reuters said, and the NRO declined to comment on SpaceX's role.

The first confirmed contract was smaller: a one-year, $70 million Space Force task order, Space.com reported in 2023, citing a Space Force spokesperson's confirmation to CNBC.

Starshield vs. Starlink at a glance

Ukraine reaches Starshield through U.S.-run arrangements. "At least some relevant services are provided through contractual arrangements administered by the U.S. Space Force," nine senators wrote in a bipartisan Oct. 15 letter.

Serhii Beskrestnov, a defense-technology adviser to President Volodymyr Zelenskyy, described Starshield to The Associated Press as a Pentagon-managed package offered to partner militaries. He said it has separate fees and terms from civilian Starlink and a higher-priority connection.

What happened in Ukraine

Beskrestnov wrote on Telegram on Oct. 14 that a speed limit had been "implemented overnight," disrupting missions, the BBC reported. Ukrainian defense ministry sources told the BBC that once a vehicle or asset exceeds the threshold, "the terminal loses its connection."

Accounts of the threshold and timing differ. Most reports cite 160 km/h (100 mph), but the senators' letter says Ukrainian testing on Oct. 14 "reportedly identified restrictions at speeds exceeding approximately 63 miles per hour." The letter dates the restrictions to "between October 12 and 14."

Musk responded on X on Oct. 14. "Starshield systems are owned and controlled by the US government. Any limits on speed or usage are decided by the US military and ultimately POTUS," he wrote, as quoted by the BBC.

Late on Oct. 15, Reuters reported that the order came from inside the White House, citing two U.S. officials and a Western official who did not say who made the decision. A senior U.S. official told Reuters, "No such request was ever made by the president."

Trump said Friday (Oct. 16), "it wasn't me, and I don't think it was Elon," according to the AP. The Telegraph separately reported, citing four sources, that Musk proposed the throttling to Trump. A White House official called that "totally false" in a statement to Axios, saying "the service is currently operational."

Where Ukraine's service stands as of Oct. 17

The cap is still in place, according to Ukraine. "Today, the maximum speed is 161 kilometers per hour," Zelenskyy said Saturday (Oct. 17), Interfax-Ukraine reported. Above that, he said, Starlink "shuts down completely."

Zelenskyy said Ukrainian vehicles tested in EU countries kept their connection above 180 km/h, which he called evidence of "a planned operation." That account hasn't been independently verified. SpaceX tells Ukraine the problems are technical, he said, while the senators wrote that Ukraine had "access to unlimited speeds" before the cap.

Denys Sienik, Ukraine's chargé d'affaires in Washington, said service had improved but speeds still fluctuated, UNN reported Oct. 17. Kyiv is still waiting for an official answer from the Pentagon and SpaceX, he said.

Speed matters because of what Ukraine is chasing. Jet-powered Shahed drones fly at more than 400 km/h (250 mph), and the cap also affects helicopters hunting propeller-driven Shaheds, the AP reported. "We were unable to intercept some of the jet-powered Shaheds," Zelenskyy said Oct. 16, according to Ukrainska Pravda.

How a terminal speed cap can work

SpaceX and the Pentagon have not described the actual mechanism, so this is how this kind of limit can work in general. The building blocks exist in commercial Starlink: terminals compute their own position, altitude and speed from a GPS chip combined with positioning from the constellation itself, according to Starlink's developer documentation.

Speed and location are already service settings. Starlink's aviation terms sell in-motion plans capped at 300 mph or 450 mph, and in-motion use can require approval country by country. A rule such as "stop passing data above a set speed" could, in principle, run on the terminal or in the network.

Because that positioning also draws on the constellation, a speed reading doesn't have to rely on GPS alone, which can be jammed or spoofed. Limiting a rule to a mapped area, such as one country, is called geofencing. That would fit Zelenskyy's account, though it hasn't been confirmed.

Our own inference from the commercial plans: because aviation kits are sold for use up to 450 mph, a 100 mph cutoff isn't a limit of Starlink antenna technology in general. Whether Ukraine's terminals are aviation-rated hardware hasn't been reported.

What happens next

Beskrestnov told the AP that Ukraine is "in active negotiations with the Pentagon, SpaceX and the U.S. government," and that "we don't know what the decision will be." Zelenskyy said Ukraine's chief negotiator, Rustem Umerov, raised the issue with U.S. envoy Jared Kushner on Friday (Oct. 16), Axios reported.

The senators' letter, led by Jeanne Shaheen and Thom Tillis, asks the Defense Department's inspector general to investigate and to give Congress an initial briefing by Nov. 1.