in a chilling twist Russian opposition leader Vladimir kerza has been moved to a siberian prison hospital his lawyers are denied access raising fears for his well-being kerza is serving a 25-year sentence for treason in Russia he survived two alleged poisonings with Nova chuk a Soviet era nerve agent despite the risks he returned to Russia stating I'm a Russian politician I have to be in Russia Cara murza suffers from polyneuropathy caused by the poisonings his case highlights the ongoing dangers faced by Putin's critics interestingly Nova chuk is eight times more lethal than VX another Infamous nerve agent subscribe for more now news