By Tom Balmforth MOSCOW (Reuters) – Police on Thursday detained more than 1,600 Russians who protested against Russia’s multi-pronged military operation in Ukraine, while authorities threatened to block media reports that contain what Moscow described as “false information”. In acts of cautious, but unusual dissent, Russian pop stars, journalists, a television comedian and a footballer opposed the war online after President Vladimir Putin launched an invasion of Ukraine in the early hours of Thursday. By 1939 GMT, police had detained 1,667 people at rallies in 53 cities, the OVD-Info rights mo…