NATO aims to recognize space as a domain of warfare this year, four senior diplomats said, partly to show U.S. President Donald Trump that the alliance is relevant and adapting to new threats after he signed off on the creation of a U.S. Space Force.

The decision, set to be taken at a Dec. 3-4 leaders summit in London that Trump is due to attend, would formally acknowledge that battles can be waged not only on land, in the air, at sea and on computer networks, but also in space.

"There's agreement that we should make space a domain and the London summit is the best place to make it official," said one senior NATO diplomat involved in the discussions, although cautioning that technical policy work was still under way.