Jenny
𝐉𝐫
If you mean AEGIS, GMD... it has a failed record w/testing & only 53% success of intercept.The US has nuclear intercept abilities now.
From space they can launch the "Bomber" which has a payload of 2 dozen nuclear warheads. I don't know the yield but, doubt they would ever use it.40% of Russias nukes can't travel more than 300 miles tho.
Therefore, according to your vast knowledge of nuclear energy, a nation built 40% of its nukes to nuke themselves.