The general reaction to various revelations of spying by the US on its friends and allies, particularly in contexts such as trade negotiations has been “everyone does it” and “in any case, there’s nothing anyone can do about it”. And, as regards direct retaliation against the US, that’s pretty much right. The situation is a bit different for junior members of the Five Eyes[^1], such as Australia. A case now being heard at the Permanent Court of Arbitration in The Hague could set a precedent that will make such spying a high risk exercise.
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