National Oil

Military helicopter carrying minister and governor crashed after surveying aftermath

Builder gets High Court protection from creditors to allow it to restructure

Undrilled acreage has been awarded for initial period of three years

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US president agrees €98bn deal with Riyadh as fallout continues over Comey firing

Dragon Oil’s independent committee considering the proposal

Brent oil gains as much as 1% in London

Assumption of oil at $80 suggests Saudi Arabia expects rebound

Prices fell $1.16 to $90.95, after earlier hitting $90.76, its lowest point since June 2012

North Sea riches will remain attractive to exploration industry, regardless of whether political authority lies in London or Edinburgh