Almost four years after being poached from a critical post at Google to join Chinese upstart Xiaomi, Hugo Barra on Monday announced he will return to Silicon Valley in February. Barra, who led the Xiaomi’s overseas expansion as vice president, international, explained the move largely as a desire to reconnect with his family and restore a sense of normalcy to his life. However, it also coincides with a widespread perception that Xiaomi’s international growth has run into a great wall.