First off, when it comes to the Ula class. It is quiet, and the crew knows its waters. A couple of years ago, during a NATO exercise, one Ula caused so much havoc, that it had to be "taken out", so the naval SAG could try to complete it's mission....
About the russians and the submarines: How do we know this is true? Submarine activity is the most secret of the secrets. I doubt the russians have the cash to play around with it's subs. Flying around in some beat up Bears is one thing, but deploying an Akula or Oscar for a month is another.
Right now a russian CVBG is at sea, heading south along the Norwegian coast (read it on the news). It's the first time since 2005 the Kuznetsov is sailing away from its pond in Severomorsk. I expected the same CVBG to deploy last year, because the russians made bid deal in the media about it. But it did not happend. Why not? Ask me, I'd say lack of money.
Also, if russian subs are deploying, why the hell are they lingering around the northern norwegian coast for? Nothing to see there, and nothing to gain politically either. What they should do, is sail towards the US west coast, pop to the surface and show uncle sam the finger. That would make sense, that would make Putin a player, and that would cause panic in the western navies.
Like I said, theres no way for us to know. But the whole story does not make sense.
Thats my two cents..