UK operations in Afghanistan are criticised in US State Department files released by the Wikileaks website, according to the Guardian.
The paper is one of several around the world carrying the latest data to be published by the whistle-blowing site.
It includes criticism of David Cameron and inappropriate remarks by the Duke of York about a law enforcement agency and foreign country, it says.
Publishing the files risks national security, the Foreign Office says.
However, former British ambassador to the United States Sir Christopher Meyer said the leaks were merely embarrassing and would not “make any difference at all” in political terms.
“What I do expect is in London and Washington that people would look very carefully about how they communicate electronically and protect the archive where it needs to be protected,” he added.
The leaked US embassy cables reportedly include accounts of King Abdullah of Saudi Arabia urging the US to bomb Iran, Afghan government corruption, Iranian attempts to modify North Korean rockets as missiles and alleged links between the Russian government and organised crime.