I don't know if he's thought through the public relations aspect of this decision in the West, or not, but apparently Vladimir Putin is reviving the Russian Cossacks. He's already submitted a draft law to the State Duma defining a "Cossack society." These Cossacks will be available for Russian military and law enforcement purposes.
Until the Russian Revolution, there were some 4 million Cossacks. Abolished by Lenin in 1920, Stalin revived the Cossacks in 1936, and Cossack Units fought the Germans in World War II. After the war, the Cossacks were again disbanded. (Thanks to Siberian Light for the tip.)