I mean....you can just launch it and let it sit in outer space and allow them to stack up in outer space. It's not considered a space weapon, it's considered ground launch/icbm so you don't break the space regulations. So there is no choice weather they'll hit or not because they are already launched, you just need to set a target and they'll fly and continue even if you get nuked. It's an assurance free of human input as some people may not launch and some of the missiles won't launch in time, so in this you don't risk losing capability due to waiting to see the first hit, you can predetermine and call off if nothing happens. Russia is being more safe in terms of nuclear strikes because they won't need to rush a launch they can control where their already launched missile will go in case the first strike does hit so you need minimal input. (Activate, designate) it's a null vehicle till activated