Mike Burgess says at least three countries are capable of "lethal targeting" inside Australia. Photo: Dan Himbrechts/AAP PHOTOS

The country's top spy has put three nations on notice after sensationally revealing there was a "realistic possibility" a foreign government would attempt an assassination on Australian soil.

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The trio were not directly named by Australian Security Intelligence Organisation director-general Mike Burgess in the 2025 Lowy Lecture on Tuesday night.

But identifying them may not have been necessary.

"The countries that I didn't mention by name know who I'm talk

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