When you're asked to paint a picture of war, what comes to mind?
It's likely to be hundreds of troops on the ground, supported by pilots flying jets and dropping bombs on targets.
That image is fast dissolving, as emerging technologies change the way countries are preparing to defend themselves.
So who is ahead in the technological race - and what are the complications and future threats?
Listen to the full conversation on ABC Australia's PM with Linda Mottram.
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