Ok, if you want to be pedantic. In a state on state conflict - you have to penetrate the transcontinental air space with an asset that will effect the kill.Ummm, I wouldn't be so sure about that. All existing (published) radar technologies rely upon electro-magnetic energy and a media converting electricity into that EM energy. So you only have to shut that process down to achieve a kill.
It is actually quite easy to disable that process in a static array. E.g. A Cessna 172 could do it.
cheers
w
Of the 4 transcontinental - intercontinenal systems in service, which state player is a threat to australia?