The BM25 aka Musudan is on mobile launchers I believe vs a silo yet it is liquid fueled. Same sort, or a close recipe, of hydrogen tetroxide and red fuming acidic oyxidizer used by our old Titan Mssiles that were stationed in KS, AR and AZ ....
They mess up that refueling it will be a BFRC event for the norks.... Aka big friggin red cloud.
Fueling indicators are not part of the readiness levels as the Missle can stay fueled for a long time.
Just what I recollect with titans and sino soviet / ChiCom ordnance ....
Archy may have more ...