A Turkish military assault on Kurdish fighters is underway in northeastern Syria. It was made possible by a U.S. decision to withdraw American military personnel in that area. Today on Front Burner, CBC Moscow correspondent Chris Brown discusses how Russia, a country with a large military presence in Syria, looks to fill the gap left by the United States. He talks about his recent trip to Syria, escorted by the Russian military, on what he says was, "effectively, a propaganda tour."