The forces of Russia and Ukraine have begun to prepare for cold weather and shortened daylight hours, which will exacerbate logistical difficulties and affect the health and morale of soldiers.
Bad weather will affect Russia and Ukraine at the same time and will likely slow down the pace of hostilities and reduce the level of combat by a third, in such cases the operation of equipment becomes more difficult.
The mines could be hidden under the ice and the need for more fuel for the generators would increase and even the bullets would be slower because cold air is denser than warm air and observers believe that all this is forcing the war effort to change as Russia will resort to air strikes as an alternative to ground action.
As for Ukraine, with Western supplies after turning to Western patrons for winter crews and equipment, it is likely to be better equipped than Russia in exchange for more motivation for its soldiers to fight.