 Russia lacks reserves to strengthen main phase of offensive in Luhansk Oblast. American Institute for the Study of War ISW states that the main phase of Russia's offensive is taking place in Luhansk Oblast, but the invaders lack the reserves to increase the scale of intensity of this offensive. The analysts note that the main phase of Russian offensive operations in Luhansk Oblast is ongoing, and Russia probably does not have sufficient uncommitted reserves to increase the scale or intensity of the offensive this winter. According to the Institute's data, Russian conventional ground forces are generally deploying and fighting in normal doctrinal formations and units rather than in battalion tactical groups or other ad hoc structures. The observed absence of several critical tank units suggests that the Russian military continues to struggle to replace equipment, especially tanks lost during previous failed offensive operations, the report reads. The experts add that the Russian forces almost certainly still have reconstituted mechanized units in reserve, but the commitment of these limited reserves to Luhansk Oblast frontline is unlikely to change the course of the ongoing offensive dramatically. According to the Institute, the Russian offensive will very likely continue for some time and may temporarily gain momentum as the final reserves are committed, if they are, but will very likely culminate well short of its objectives and likely short of achieving operationally significant gains.