The United Nations will cut a quarter of peacekeepers in 11 operations around the world in the coming months due to a lack of money, senior U.N. officials said on Wednesday, and as future funding from the United States remains uncertain.

"Overall, we will have to repatriate ... around 25% of our total peacekeeping troops and police, as well as their equipment, and a large number of civilian staff in missions will also be affected," said a senior U.N. official, speaking on condition of anonymity.

That would amount to between 13,000 and 14,000 troops and police, the official said.