The United States has informed Congress and its allies in Europe about Russian advances on a new, space-based nuclear weapon designed to threaten America’s extensive satellite network, according to current and former officials briefed on the matter.

Such a satellite-killing weapon, if deployed, could destroy civilian communications, surveillance from space and military command-and control operations by the United States and its allies. At the moment, the United States does not have the ability to counter such a weapon and defend its satellites, a former official said.

Officials said that the new intelligence, which they did not describe in detail, raised serious questions about whether Russia was preparing to abandon the Outer Space Treaty of 1967, which bans all orbital nuclear weapons. But since Russia does not appear close to deploying the weapon, they said, it is not considered an urgent threat.

The intelligence was made public, in part, in a cryptic announcement on Wednesday by Representative Michael R. Turner, Republican of Ohio and the chairman of the House Intelligence Committee. He called on the Biden administration to declassify the information without saying specifically what it was.

ABC News reported earlier that the intelligence had to do with Russian space-based antisatellite nuclear weaponry. Current and former officials said that the launch of the antisatellite did not appear imminent, but that there was a limited window of time, which they did not define, to prevent its deployment.

Concerns about placing nuclear weapons in space go back 50 years. The United States experimented with versions of the technology but never deployed them. Russia has been developing its space-based capabilities for decades.