Tens of thousands of Russians have flooded into Moscow for the first mass protest against President Vladimir Putin, since he returned to the top job in May.<br /> <br />The country is marking Russia Day, a national holiday.<br /> <br />Numbers appear to have swelled well beyond a 50 thousand limit, despite a series of raids on the homes of protest leaders.<br /><br />Al Jazeera's Rory Challands reports from Moscow.
