[kronos77]

Answer is simple and logical.
S-300 and S-400 are lethal and sophisticated, and only way that they can be destroyed is by low-level-just over-ground attack by jets.

There fore they are guarded by Pantsyr making them virtually untouchable

[cunning_fish]

‘Answer is simple and logical.
S-300 and S-400 are lethal and sophisticated, and only way that they can be destroyed is by low-level-just over-ground attack by jets.

There fore they are guarded by Pantsyr making them virtually untouchable’

There is no 100% effective system. Do not overestimate it.
At the same time underestimateng it is dumb too.