The past few years have seen an uptick in Russian covert actions across Europe, including assassinations and attempted killings of people in Ukraine, Bulgaria, Germany, and the United Kingdom. Just this week, Bulgaria charged three Russian agents with the poisoning of a prominent Bulgarian arms manufacturer. Michael Schwirtz has been an investigative reporter with the New York Times for almost 15 years, and he's been tracking this Russian skulduggery carefully in many of those countries for much of that time. Recently, he's reported on how quite a bit of that activity is linked to one particular unit within the Russian GRU. David Priess sat down with Michael to work through this increasingly aggressive Russian action and what it all means going forward.