A senior Ukrainian official has accused Elon Musk of "committing evil" after a new biography revealed details about how the business magnate ordered his Starlink satellite communications network to be turned off near the Crimean coast last year to hobble a Ukrainian drone attack on Russian warships.

In a statement on X, the social media platform formerly known as Twitter, which Musk owns, the Ukrainian presidential adviser Mykhailo Podolyak wrote that Musk's interference led to the deaths of civilians, calling them "the price of a cocktail of ignorance and big ego".

"By not allowing Ukrainian drones to destroy part of the Russian fleet via Starlink interference, @elonmusk allowed this fleet to fire Kalibr missiles at Ukrainian cities. As a result, civilians, and children are being killed," Podolyak wrote.

"Why do some people so desperately want to defend war criminals and their desire to commit murder? And do they now realise that they are committing evil and encouraging evil?"

Musk defended his decision, saying he did not want his SpaceX company to be "explicitly complicit in a major act of war and conflict escalation".

CNN on Thursday quoted an excerpt from the biography Elon Musk by Walter Isaacson, which described how armed submarine drones were approaching a Russian fleet near the Crimean coast when they "lost connectivity and washed ashore harmlessly".