[vasac]

Tank armor can be good as it gets, the problem is you can't have good armor everywhere on the tank otherwise it would weight hundreds of tons. So a small drone doesn't need to penetrate tank where it's best protected but to disable it (hit APU, tracks, engine...).

[ashoeafoot]

Obvious solution, make the tank amour a drone crawling around and building up in direction of danger?

[throwawayffffas]

The obvious solution, is duct tape a bunch of corrugated steel around the tank, https://en.wikipedia.org/wiki/Turtle_tank