Ukraine is a giant nation and a number of the foremost roads to maneuver heavy stuff like ammo is destroyed or getting used to ship different vital tools. It will probably take weeks to move items. By the point the subsequent batch is reinforcing, the final batch is drying up, if issues begin hindering the provision chain or extra issues get added in, folks begin to run out of stuff on the entrance. Logistics is sophisticated particularly when you possibly can’t simply fly a aircraft over or round the place provides are wanted and drop it.