Experts say several other countries have also mobilised reserves during past engagements when wars lasted longer than expected.
Mass conscription, intended to enlist 300,000 troops, begins in Russia while Ukrainian President Zelenskyy calls on Russians to resist "partial mobilisation" or "surrender" to Ukrainian army.
Subscribe to our Youtube channel for all latest in-depth, on the ground reporting from around the world.
Copyright © 2023 TRT World.