The head of the Russian space agency, Dmitry Rogozin, has threatened tech billionaire Elon Musk with consequences for supplying Ukraine with satellite internet.
Musk's space company SpaceX provided the country under Russian attack with facilities to use its Starlink satellite network - to provide it with high-speed Internet from space.
This was helpful for Ukrainian authorities and troops when mobile communications and local Internet access failed.
Rogozin wrote on the Telegram chat service on Sunday that Musk was “involved in supplying fascist forces in Ukraine with military communications”.
He will have to answer for this “like an adult”.
Musk responded on Monday night on Twitter with a joke: "If I should die under mysterious circumstances - it was good to have known you." Musk is also the head of the electric car manufacturer Tesla and is currently trying to buy the short message service Twitter.
Roskosmos boss Rogozin, on the other hand, is a vocal supporter of the Russian attack on Ukraine and speaks, among other things, of a war in which Russia's survival is at stake.
He also wrote on Telegram on Sunday that Russia could destroy the NATO countries in a nuclear war within half an hour, "but we must not allow it because the consequences of a nuclear exchange would affect the state of our earth".