No good.
Just saw this report (from the same source that recently mentioned the Rangers and Flyers interest in Burdasov) that Shesterkin is not happy with a two-way contract that Rangers could offer to Shesterkin (i.e. a chance to be send to Hartford) and is in the process of (or interested in) negotiating a new contract with SKA. No further details.
ELC is standard and there's nothing that could be done from that perspective, but maybe the Rangers could not offer Shesterkin informal assurances that he will not be sent to the AHL and given the situation with Lundqvist and Georgiev - it certainly is a possibility.
Russian link below.
Вратарь Шестёркин близок к продлению контракта со СКА