I heard what sounded like an "A" with a long dit, or perhaps a quick "M" in CW on 10126 khz. yesterday, 6/26, at 0356 UTC, and a bit weaker during recheck of the frequency at 0411 UTC.
I'm not sure if this is a Russian single letter beacon or not, as this frequency isn't on any of the lists of Russian naval beacons.
If it is a Russian beacon, I'm guessing the letter would have been an "M", as Magadan is the closest Russian port to the NW US.