If Russia were to launch 100 of their most capable missles simultaneously at random areas targeting the US, could they all be stopped?

No. We would be lucky to stop ten warheads.(Look up M.I.R.V. warheads.)

No country would be able to survive that.

no they couldn't

No. There has been controversy among experts about whether it is technically feasible to build an effective missile defense system and, in particular, if it will work. An April 2000 study by the Union of Concerned Scientists and the Security Studies Program at the Massachusetts Institute of Technology concluded that "[a]ny country capable of deploying a long-range missile would also be able to deploy countermeasures that would defeat the planned NMD system." Countermeasures studied in detail were bomblets containing biological or chemical agents, aluminized balloons to serve as decoys and to disguise warheads, and cooling warheads to reduce the kill vehicle’s ability to detect them.

why would they waste them on the US

Like they stopped 9/11 yeah Russia do not brag like America they got into space first their technology is as good if not better from Custer to Vietnam the USA has always overrated its capabilities YOU WILL NEVER WIN haven't the brains plenty of money reflects your President exactly a thumbs down changes nothing Custer was warned he didn't listen took his men with him thanks boss

No. That is the whole point of a nuclear deterrent. You can't defend against it.

no way

Yes

Yes