From the "news" it was a 971 'Bars' class sub, appx. as silent as an LA class sub or so they say.
Regarding which is noisier, the 571 or a 705 'Lira' - at which speed ?

The Alfa with its 45 knots would just outrun a contemporary Nautilus torpedo - wasn't that the reason why the Mk48 was developed (?)
Anyway russian subs meanwhile take part in NATO maneuvers, and lie cheek to cheek to Nato boats in internationsl harbours.
Also american subs have filmed russian prototypes near their harbours violating russian territorial limits for decades, so what's the big deal now ?
To be honest I would be more afraid of the Mafia than of the Russians lol
Greetings,
Catfish