On Sunday, police brutally dispersed a group of demonstrators who came to Moscow’s Pushkin Square, the traditional site of dissident rallies since the Soviet era, to denounce Vladimir Putin’s presumptive attack on Ukraine. The protesters, who included veteran human rights leader and former member of parliament Lev Ponomarev, were detained as soon as they unfurled their banners; some were taken into police custody and charged with violating Moscow’s strict ban on public demonstrations imposed und