"Russia’s Novaya Gazeta newspaper has called into question Plotnikov, a Muslim convert who fled Toronto, Ontario, Canada in 2012 to fight against Russian security forces. According to the paper, Plotnikov and the elder Tsarnaev brother connected over the Internet during the years before and may have motivated one another to use violence in getting their points across."


http://rt.com/usa/boxer-tamerlan-plotnikov-tsarnaev-585/