I don't know authoritative you can consider a publication that notes Sydney as Australia's capital.
Canberra is quite used to being looked over by this point.
Pretty sure I don't need to read the article - its seems very obvious.
For anyone who wants the obvious answer: China
Not sure why this was almost immediately flagged- maybe the self promotion? The topic seems interesting.
It doesn't really very much, and what it does say sounds to me to be ... incorrect : "which allows both states to conduct military exercises in the territory of the other country without permission".
And yes, self-promotion.
How can you see that it was flagged?
Edit: OK now I see it was flagged because the whole title doesn't exist anymore. But it didn't look like that when I first wrote this comment.
Good. It's the natural path for the "free world" to form a defense against the unilateral autocratic cabals that have no requirement to answer to the peoples.