Hyperveocity can also be achieved through the use of rocket propellant...and we have them, along with the kinetic penetrator warhead at the sword end.
Depending on the location of the tank, and whether it was sitting or moving...you can certinly obtain 100m LOS. ie. park one at an intersection.
As I said...most likely a Kornet, or a lucky RPG-7, perhaps with the newer shoot from above warhead.
Now you're back to minimum-range issues. It takes much more to accelerate a rocket projectile to Vmax. In essence, you're trading minimum range against recoil forces.
Depending on the location of the tank, and whether it was sitting or moving...you can certinly obtain 100m LOS. ie. park one at an intersection.
LOS, of and by itself, isn't difficult.
LOS from a position of concealment (which is kind of necessary to survive firing): rather more difficult.