Dimitry Rogozin warned that Russian tech and expertise is needed to prevent the ISS from crashing down onto the US or Europe.

"If you block cooperation with us, who will save the ISS from an uncontrolled deorbit and fall into the United States and Europe?" Rogozin tweeted on Friday, following president Joe Biden's announcement of sanctions over Russia's invasion of Ukraine.

But Musk weighed in by replying to Rogozin's threat with the SpaceX logo.

When a Twitter user asked the billionaire if this meant SpaceX would keep the ISS from falling onto Earth, Musk replied: "Yes."

He also replied to a tweet that showed the ISS without the Russian segment and a SpaceX Dragon attached instead.

"Good thread," Musk wrote.