Moscow died for SIA when Russia annexed the Crimea and the West imposed sanctions. The profit on the SIN-DME sector was garnered from the financial and high end business travellers and by mid 2014 they were deserting Moscow in droves. In Houston there was talk in business and aviation circles of the need to keep the Singapore link and the initial talk was of a route across the Pacific with San Diego or Honolulu as a waypoint. By the Autumn of 2014 Manchester was seen to be firmly in the frame, then all went quiet.
Given the visa requirements and the fact that Turkey is now being opened to Russian tourists again, albeit at some risk, a Scoot service to Moscow is going to be marginal even at their costs.