@SteveMelnikoff: That's what sovereign territory means: one cannot enter it without the permission of the controlling state. There's a fiddling distinction here between 'land' and 'territory'. The land itself is 'owned' by the host state, but the territory (an abstract notion that expresses political control rather than legal ownership) is ceded
pro tem to the embassy state. It's a bit like a teenager's bedroom: the parents may own the house, but the teen owns the
space, and all hell might break loose if the parents cross that boundary. —
Ted Wrigley yesterday