The lawyer leading a UN drone inquiry has praised a speech by US President Barack Obama as a "significant step towards increased transparency".
Ben Emmerson said Mr Obama had set out more clearly than ever before the legal justifications for targeted killing.
Pakistan, the main focus of the strikes, has reiterated its view that drones are "counter-productive".
Mr Obama pledged to continue strikes, but with tighter oversight of the programme and stricter targeting rules.
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