I have not done the loop, but I have been on Russell in winter conditions. If you are thinking of doing the East Ridge, then I would suggest bringing a rope and some gear. When the slabs get covered in snow and ice it's no longer class 3, particularly the transition from the ridge to the east face of the east summit. I would be prepared to set up a fixed belay there for a short pitch. Maybe running belays elsewhere depending on conditions and your ability and confidence level. If you were thinking of the south chute then that will probably be more straightforward and less exposed, though still worthy of caution.