 By the time the Azeri attack had been defeated at the end of the month, another three helicopters and possibly another fighter – reportedly a MiG-21 (and therefore probably Russian) – would be lost.In late March 1993, the Armenians kicked off a new offensive in the north aimed at opening a second supply route from Armenia.Operation Kelbajar involved a four-prong attack which was successful in routing Azerbaijan’s 2nd Army Corps and securing control of the region.