what's interesting : " built from the 1st century BC to the 1st century AD,"
since 2000 years, not cacademic years, "more or less", no problems... otherwise it wouldn't be there, and now , only through UNESCO / UNO seal can it be safe...
normative authority transfered more and more in the realm to even the body of others, through the "just a jab"
maybe to put the kremlin, under UNESCO mandatory inspection for safeguarding would piss enough the owner, for a mind set evolution...