A fleet of SpaceX Starlink internet satellites is seen poised for deployment in orbit in this file image from a May 24, 2019 launch.

A fleet of SpaceX Starlink internet satellites is seen poised for deployment in orbit in this file image from a May 24, 2019 launch. (Image credit: SpaceX)

Musk said Friday that his company is now focusing on cyber defense and overcoming signal jamming of its Starlink internet satellites.

Musk and his company sent Starlink terminals to Ukraine at the request of a government official after internet service was disrupted across the country by the Russian invasion. A shipment of Starlink ground terminals, which use an antenna and terminal to access the satellite broadband service, arrived in Ukraine by Monday. Musk said that they are working to keep the terminals online.

Some Starlink terminals were being jammed for several hours at a time, according to Musk.

Related: How will Ukraine keep SpaceX's Starlink internet service online?

Photos: Russia's invasion of Ukraine as seen in satellite images

SpaceX reprioritized to cyber defense & overcoming signal jamming. Will cause slight delays in Starship & Starlink V2.March 5, 2022

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Musk said that the Starlink service is likely to be disrupted elsewhere.

He wrote Friday that SpaceX reprioritized to cyber defense and overcoming signal jamming. The measures were unexpected quality assurance work for the Starlink system.

Musk said the Starlink work will cause slight delays.

The Super Heavy booster is a huge re-usable booster that can be used to launch missions into deep space. NASA wants to land astronauts on the moon with the help of the Starship vehicle. The first flight of an uncrewed Starship is expected to launch in the next few months. Starlink V2 includes laser links between satellites and other enhancements.

Important warning: Starlink is the only non-Russian communications system still working in some parts of Ukraine, so probability of being targeted is high. Please use with caution.March 3, 2022

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Musk warned that the system could make users vulnerable to Russian military attacks.

Starlink is the only non-Russian communications system still working in some parts of Ukraine, so it's a high chance that you'll be targeted. Please use with care.

Musk said that Starlink should be turned on only when needed and that the antenna should be placed away from people.

Starlink satellites were sent into space on a Falcon 9 rocket. The new Starlink satellites were launched from Pad 39A at the Kennedy Space Center. More than 2,000 satellites have been launched by the company, with plans for an initial megaconstellation of 12,000 to provide global broadband coverage.

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