Our limited anti-missile system isn’t of any real use against the Russians. It can deal with a few missiles lobbed at us by North Korea, Iran or possibly China, but Russia could easily overwhelm the system.
Of course, Russia isn’t very likely to launch against us.
The only sure way to get a Russian missile is to nail them when they are at their boost phase. This is where ABL comes in.
Except mostly on the East Coast and thru the Gulf & to regain Alaska.
China’s been allotted the East Coast and through Mexico.