It's a spring afternoon in downtown Moscow. Pushkin Square, a major hub of the Russian capital, is as vibrant as ever. Even those who hurry along on urgent errands steal a second to stop and enjoy the sunshine after weeks of rain and snow. But the atmosphere in one corner of the square is more menacing. A crowd of about 80 teenagers is chanting "Kill the U.S.A.!" and raising their arms in the Nazi salute. Zakhar, aged 15, with shaved head and camouflage shirt, is reluctant to talk to a journalist, but makes an exception to explain that the rally is...
