Click on the 'Listen' button above to hear this interview.  In St. Petersburg, Russia, a bomb on a subway train in St. Petersburg killed an estimated 10 people and injured dozens more on Monday. Russian police suspect that a 22-year-old man from a former Soviet Central Asian country who had links to Islamic groups was behind the attack, and also planted a second bomb at another subway station that was defused before it detonated. The attack comes on the heels of growing agitation in the country. In recent weeks, thousands of Russian citizens gathered in 100 cities across the country to protest the government of Vladimir Putin, and additional smaller protests took place this past weekend. Joshua Yaffa, a contributor to The New Yorker and a fellow at New America, discusses the growing tension in Russia.