The Knyaz Pozharsky submarine of the Project 955A/Borey-A class was accepted for service in July 2025. The formal acceptance would normally take place in December, but with Knyaz Pozharsky it was postponed for about six months, presumably to complete the trials which include a test launch of a Bulava missile.

It is not clear if the expected test launch actually took place. In June 2025 Russia submitted NOTAM notifications that correspond to a Bulava test from the Barents Sea to Kura during the 20-21 June 2025 window (kmz file, h/t EM for identifying the dates). There were no reports about the launch, however. This does not necessarily mean the launch failed, although it is unusual to see a successful test not being officially reported. It's not unprecedented - see a launch in 2016 and in 2023 - but rather rare. Also, these were not state acceptance launches.

One sign that may indicate a scrubbed launch is the NOTAM cancellation record. Or, rather, lack thereof. NOTAMs were not cancelled and just expired when the announced launch window ended at 17:00 on 21 June 2025 (it opened at 05:00 on 20 June 2025). Normally, a NOTAM is cancelled right after a successful launch. See, for example, the Sineva launch on 22 October 2025 - the NOTAM covered the window from 21 October to 28 October, but was cancelled at 12:48 on 22 October 2025, right after the launch. This may not be very conclusive, however - the June window was rather narrow and the launch may have taken place close to its end anyway.

At this point I would wait for more evidence one way or another. It does appear that the launch was scrubbed, but I don't think it can be said with certainty.