Vympel, abbreviation of the Directorate в (Russian Cyrillic for V) of the TsSN FSB of the Russian Federation, is still a classified and secretive unit. It took part in Russia's Chechen campaigns and in storming of the Supreme Soviet building during the 1993 Russian constitutional crisis. Little is known about its current operations and activities, with the exception being the capture of the Chechen militant leader Salman Raduyev in March 2000 and the assault on the school in Beslan in September 2004.