Russia side proposes to China to do a trade. It's 100K tons ski jump , nuke powered carrier design to trade for a 055 made ship. China immediately turned it down. No way, a blue print exchange for a made ship.Russia has its eyes on 055!
In my POV, 2 055 can traded for a yeltsin sub.
That seems rather improbable, there is hardly any pressing need or indeed the will for Russia to be inducting any large kinda of surface combatant into it's navy. Indeed its latest navy report specifically highlights that it is focusing on frigates for the near future. More importantly, if there is any deal of such a kind to be made, Russia is definitely going to have it made in its own shipyards, for all the same reasons as China or any other nation that wants to preserve and maintain its shipbuilding capacity.
This kinda talk seems more of a fanboy claim than any serious discussion.
On the point of the Yasen, no way on earth would Russia be peddling the crown jewel of its navy technology for anything of at least equal, if not more, value. The kind of military shift that can be brought about by a modern and capable SSGN can hardly be overstated. Even extremely close allies like the UK and the US are rather loath to share their respective secrets regarding sub tech as well.