By Julien Pretot, Karolos Grohmann and Iain Axon BEIJING (Reuters) – Russian skating prodigy Kamila Valieva’s failed drug test prior to her dazzling Winter Games team gold threw the 15-year-old’s Olympic future into doubt and reawakened global anger over Moscow’s doping history on Friday. But the Kremlin – already facing Western diplomatic wrath over a troop buildup near Ukraine – was also defiant in the sporting terrain, calling Valieva’s case a “misunderstanding”. “Hold your head up, you’re a Russian,” government spokesman Dmitry Peskov urged her. “Go proudly and beat everyone.” The teenager…