The head of the Russian space agency Roscosmos has warned Elon Musk in no uncertain terms that his aid to Ukraine could cost him dearly. That threat is the free internet that the richest man in the world provides to the country.

Musk has been offering free wireless internet in Ukraine since shortly after the Russian invasion via the 2,000 satellites of his company Starlink. But, according to the billionaire, there have been several cyber attacks on that company since then and attempts to block the Starlink signal in Ukraine.

Dmitry Rogozin, the director of the Russian space agency Roscosmos, warned Musk in Russian media on Sunday evening. “He provides support to the Nazi Azov battalion and the Ukrainian army. In that way, he is involved in providing military communications to the fascist armed forces in Ukraine. And you will have to pay the price for that later, Elon,” said Rogozin. “However foolish you are now.”

Musk responded with a touch of humour, as is often the case. “The word ‘Nazi’ doesn’t mean what he thinks it means. But if I die under mysterious circumstances, it was nice to know you.” Although that joke did not go down well with his mother, Maye Musk, who said it was “not funny”. “Sorry! I will do my best to stay alive,” Musk said.