 The last one on 26 November 1994 ended with capture of 21 Russian Army tank crew members, secretly hired as mercenaries by the FSK (former KGB, soon renamed FSB); their capture was sometimes cited as one of the reasons of Boris Yeltsin's decision to launch the open intervention.In the meantime, Grozny airport and other targets were bombed by unmarked Russian aircraft.During the First Chechen War, Grozny was the site of an intense battle lasting from December 1994 to February 1995 and ultimately ending with the capture of the city by the Russian military.