What is Explosive Reactive Armor and How is it Used in Ukraine?

The evolution of armor, especially in the High Medieval era, shows a steady escalation from leather & wool, to chainmail, to plate armor to counter advances in weaponry, specifically projectiles.

That same evolution can be seen applied to armored vehicles in the 20th Century.

Reactive armor (RA) was first developed during the 1970s as a means of protecting armored vehicles against shaped-charge anti-armor weapons, including Handheld Infantry Weapons (HHIWs) and Anti-Tank Guided Missiles (ATGMs).