Hell they know now could use that as a bargaining chip. Float one along down the line with an EMP weapon and then invade Taiwan and tell us to stay out or they'll blow the payload. Like sure we could pop the silos and glass their countryat that point but that'd be a moot point after an emp blows.

Even the most optimistic projections predict a 50-60% reduction in the US population after such an event and years to repair the damage if we even could.