Regulations/Directives are intended to be evergreen, basically to avoid that exact sort of situation. But assuming you opt for one that has "don't X until Y," Y would just need to be something that can't be "solved."
"You cannot Crush an enemy until March 1st" isn't a good Directive, since after March 1st it stops being applicable. It's certainly possible based on the game you're playing, but I'd advise towards more defined, consistent Regulations/Directives