Exclusive: Leaked U.S. intel document claims Serbia agreed to arm Ukraine

FILE PHOTO: A Ukrainian service member is seen in a trench at a position on a front line, as Russia's attack on Ukraine continues, near the city of Bakhmut, Ukraine April 10, 2023. REUTERS/Oleksandr Klymenko/File Photo

WASHINGTON/BELGRADE (Reuters) - Serbia has agreed to supply arms to Kyiv or has sent them already, according to a classified Pentagon document, despite the country's professed neutrality in the Ukraine war and refusal to sanction Russia over its 2022 invasion.

The document, a summary of European governments' responses to Ukraine's requests for military training and "lethal aid" or weapons, was among dozens of classified documents posted online in recent weeks in what could be the most serious leak of U.S. secrets in years.