Russia appears to have made another attempt to launch a Yars ICBM from Plesetsk. It issued a NOTAM notification with a window opening at 6:00 UTC on 25 December 2025. It probably notified the United States about the upcoming launch: the United States dispatched an RC-135 Cobra Ball aircraft to monitor the launch. The aircraft returned to the base after an 18-hour flight, but the launch did not take place on the 25th as the NOTAM was not cancelled. Cobra Ball flew another mission on December 26th (taking off around 2:00 UTC), this one lasting about five hours. The NOTAMs were cancelled around 08:20 UTC on December 26th and the aircraft returned to the base.

It is not clear whether a launch took place on the 26th or was cancelled as was apparently the case with the attempt in early December. Given that no reports about the launch appeared in the Russian media, a cancellation is more likely.