I think those drones are equipped with a single armour piercing round ?

Edit: yes they do , here is a good article with pictures https://www.reuters.com/graphics/UKRAINE-CRISIS/DRONES/dwpkeyjwkpm/

Definitely not proper armor, versus Ukrainian drone wizards. Or maybe Putin is just trying to save money with fake armor.

Love the efficiency: Inexpensive remote operated drone... whirr, boop... big scary expensive Russian machine (and poor bastards inside) instantly destroyed. Video uploaded. Repeat.

Enough against small arms fire. That is good enough to surive a near miss of an artillery piece.