 The Azeris initiated a new offensive on 1 January 1993 which was successful in cutting the Lachin corridor the following day, thereby isolating Armenian forces in Nagorno-Karabakh from resupply from Armenia proper.The Armenian Air Force helped bring up reinforcements for a counterattack that began 7 January.The first day of this action, the Armenian Air Force suffered its worst single-day losses with an Mi-8, Mi-24 and a (possibly Russian) Su-25 shot down; the Su-25 may have been brought down by friendly fire.