After Elon Musk’s Twitter tirade on an overly simplified solution to the Ukraine-Russia war, his company Starlink is now being questioned for its timely outage to Ukraine’s Internet service.

Ukrainian government officials anonymously spoke with Financial Times and revealed that Starlink had been offline multiple times in various instances when Ukraine was pushing toward Russia. The officials said this created a “catastrophic” loss of communication between troops.

Ukraine’s advantage over Russia has been its advanced communication lines and its support from satellites and drones in locating enemies. However, after Starlink stepped in to “donate” satellite internet access to Ukrainian troops.

V.S. Subrahmanian, a professor of computer science at Northwestern University, told Newsweek that Starlink stepped in after Russia “basically took out all of Ukraine’s military communications.”