When main battle tanks first appeared in the first world war, troop protection was one of its main selling points. it rolled into the battle field, clad in armor, to stop the machine gun fire from disseminating the soldiers marching in the rear. eventually as time went by, tanks will evolve with a balance of mobility, protection and firepower. the armors of modern tanks could stop most projectiles, but its protection is not absolute. tanks have a tendency to become steel coffins, especially in the event of armor failure. certain projectiles were developed to counter such protections, and overtime it became a constant evolution between armor and anti-armor. with that said, military analysts were scratching their heads after seeing how russia messed up in ukraine.