The Russian curler Alexander Krushelnitsky has been formally charged with a doping offense by the Court of Arbitration for Sport after testing positive for the banned substance Meldonium. He is now likely to be stripped of his mixed curling bronze medal, won with his wife Anastasia Bryzgalova last week. There are also growing questions about the International Olympic Committee’s decision to invite 168 Russians to compete here under a neutral flag, despite the country’s massive state-sponsored doping program in Sochi four years’ ago. But as Krushelnitsky was leaving the Winter Olympics on Monday morning his Olympic Athletes of Russia team-mates…