US President Joe Biden announced Friday that he had ordered the intelligence services to "better secure" classified documents and information after a young soldier leaked a series of top-secret defense documents, especially related to the war in Ukraine, which caused great embarrassment to Washington.

"As we continue to determine the authenticity of these documents, I have directed the military and intelligence community to take measures to better secure sensitive information and limit its distribution," Biden said in a statement.

He added, "Our team for national security affairs is coordinating closely with our partners and allies," praising the "speed" with which the security and judicial agencies moved following the leak of confidential documents.