The arrest of Kolesnikov has driven the Yanukovich true believers absolutely ape-shit. Kolesnikov was a pretty big mover and shaker with the Donbass oligarch clans, and if he goes down (legitimately or not...exactly what he has been charged with hasn't been officially announced) then pretty much any of them are vulnerable. Kolesnikov has business interests common with other Donbass heavyweights and evidence brought out investigating him could quite easily affect other people that came out on the short end of the stick when Yushenko won.
So what original idea do the Yanukovich supporters come up with to demonstrate their displeasure with this arrest? Set up a tent city in Kiev!