Remember the mammoths, say the clean-cut organisers at the youth camp's mass wedding. "They became extinct because they did not have enough sex. That must not happen to Russia". Obediently, couples move to a special section of dormitory tents arranged in a heart-shape and called the Love Oasis, where they can start procreating for the motherland. With its relentlessly upbeat tone, bizarre ideas and tight control, it sounds like a weird indoctrination session for a phoney religious cult. But this organisation - known as "Nashi", meaning "Ours" - is youth movement run by Vladimir Putin's Kremlin that has become a...