Alexei Navalny will challenge Vladimir Putin in March's presidential election. Mr Navalny is widely regarded as the only candidate with a chance of challenging the president, who is seeking a fourth term that would see him become the longest-serving Russian leader since Joseph Stalin. Also, Christians in Mosul celebrate Christmas for the first time in four years after the Islamic State were defeated and driven out of the city, and a report on a unique New Year's celebration in Japan.
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