Tech billionaire Elon Musk (left) said any limits on Starshield systems’ speed or usage were decided by the US military and ultimately US President Donald Trump. (AFP pic)WASHINGTON: The Starshield military communications system is "back" in Ukraine, Donald Trump said Thursday, after the Wall Street Journal reported the US president asked tech billionaire Elon Musk to restore the service, which is vital to Kyiv's forces.

"I don't want to comment on it, you know, whether I called or whether somebody else called - doesn't make any difference," Trump told journalists when asked about the report.

"I guess the bottom line, he put it back," Trump said, referring to Musk.

The Journal reported earlier this week that Musk had capped the speed at which Ukrainian equipment could connect to the system, making some of Kyiv's drones useless.