Russia is developing a space-based nuclear capability that has the potential to threaten the U.S. and its allies, according to a source familiar with the matter. Russia's capacity could allow it to target satellites, the official said.

National security adviser Jake Sullivan told reporters he plans to meet with House leaders on Thursday, though he did not confirm the topic of the briefing.

It is unclear what exactly the capability is that Russia is working on — importantly whether it is a nuclear-powered device or a nuclear weapon

Supplying Ukraine with Western arms only serves to worsen the ongoing conflict between Moscow and Kiev, Russian Deputy Foreign Minister Sergey Ryabkov said on Saturday, warning that Russian forces could potentially target such deliveries.

“We have warned the US that pumping up Ukraine with arms from several nations orchestrated by [Washington] is not just a dangerous move but something that makes these [arms] convoys legitimate targets,” Ryabkov told Russia’s Channel One. He did not elaborate on where and when Russia might target the convoys.

Ryabkov also warned that the “mindless handover” of “dangerous arms” like portable air-defense and anti-tank missiles poses a threat to Western nations themselves.?