Undiscovered Second World War bombs and tank shells have been detonating as a wildfire continues to rage across the North York Moors, filling the air with smoke and forcing residents to brace for possible evacuation.

NATO's top official warned its members on Thursday that the alliance is not prepared for the multiple global threats coalescing at once and that a much greater military spend will be required by all nations in the alliance, News.az reports citing foreign media.

A senior NATO military leader has urged businesses to prepare for a 'wartime scenario' by reshoring their production lines, rather than relying on countries like China and Russia, which could cut off access to supplies during a conflict.

Swedish Prime Minister Ulf Kristersson said Monday he was open to allowing US nuclear weapons on Swedish soil in wartime, News.Az reports citing Anadolu Agency.