The congressmen cited Ukraine's claims that there was "systemic" use of Starlink terminals in Russia. Musk has said that to the best of SpaceX's knowledge, "no Starlinks have been sold directly or indirectly to Russia."

Garcia and Raskin said in the letter that the reports that Russia may be obtaining and using the technology to coordinate attacks against Ukraine were "alarming" and "potentially in violation of US sanctions and export controls."

"We are concerned that you do not have appropriate guardrails and policies in place to ensure your technology is neither acquired nor used illegally by Russia," they wrote.

Elon Musk has consistently denied that Russians are using Starlink.

Representatives for SpaceX did not immediately respond to a request for comment from Business Insider, made outside normal working hours.

Ukraine recently claimed it was working with SpaceX to stop Russia from using Starlink terminals amid the conflict.

In an interview with the Ukrainian public broadcaster Suspilne, a Ukrainian minister said his officials had offered SpaceX a solution for blocking Russia.

"We found an algorithm and proposed it to SpaceX, and we are now communicating with them to ensure that such cases do not occur," Mykhailo Fedorov, the country's minister for digital transformation, said.