Elon Musk has denied switching off Starlink satellite internet and called for an immediate truce between Russia and Ukraine.
The 52-year-old South African-born billionaire had been accused of covertly instructing his engineers to deactivate the communications network during a major Ukrainian offensive.
They claimed it was part of a plan to thwart the secret attack, adding that Ukrainian submarine drones, armed with explosives, lost connectivity as they advanced towards Russian warships.
But Mr Musk denied the accusations on Twitter on Thursday.
“The Starlink regions in question were not activated. SpaceX did not deactivate anything,” he wrote.
“Both sides should agree to a truce. Every day that passes, more Ukrainian and Russian youth die to gain and lose small pieces of land, with borders barely changing. This is not worth their lives.”
Satellite terminals donated by Mr Musk’s SpaceX, as well as the US government and private donors, have become vital to Ukrainian military communications.