The format of the documents is similar to that „used to provide daily updates to our senior leaders on Ukraine and Russia-related operations, as well as other intelligence updates,“ Mr Meagher added.

The Pentagon first became aware of the document leak last week, with Defence Secretary Lloyd Austin first briefed on the matter on 6 April, he said.

Mr Meagher said that the document leak has prompted US officials to reassure its allies „of our commitment to safeguarding intelligence and fidelity to our security partnerships“.