Serbian supporters of Russia's invasion of Ukraine wave Russian and Serbian flags, which have the same colors but in different order, during a March 2022 rally in Belgrade. (Vladimir Zivojinovic/AFP/Getty Images)
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The Serbian government on Wednesday rejected claims that it had sent weapons to Ukraine and doubled down on its policy of noninvolvement in the war, after a leaked U.S. intelligence document, the authenticity of which could not be verified, appeared to indicate that the Balkan country provided lethal aid to Kyiv.

“Serbia has not sent any weapons to Ukraine and all allegations published on that topic are false rumours,” Serbian Defense Minister Milos Vucevic said in a statement. “Someone obviously aims to drag Serbia into that conflict.”

Serbia is among just a few European countries that have not issued sanctions targeting Russia, with which it has close cultural and business ties, in response to Moscow’s invasion of Ukraine last year. Belgrade has struggled to balance these policies with its long-standing ambition to become a member of the European Union.

Brussels views Belgrade’s ties to Moscow with concern and has sought to pressure Serbia to join the sanctions effort. The Balkan country has refused, although it voted at the United Nations to condemn the war and Russia’s illegal annexation of Ukrainian territory.

The denial on Wednesday puts Serbia on a growing list of countries that have publicly rejected or questioned the authenticity of leaked documents that appear to detail the breadth of U.S. espionage on both friendly and hostile countries.

The leak, which could be the largest to hit U.S. intelligence and defense agencies in years, has sent Washington scrambling to smooth diplomatic slights and to find the original source of the breach. The reports appear to have first started to circulate on the chat application Discord weeks ago.

The document in question, titled “Europe: Response to the ongoing Russia-Ukraine conflict,” assesses the positions of more than three dozen European countries and NATO members. The classified memo includes Serbia on a list of countries that have “provided or committed to provide lethal aid” to Ukraine and that have the “military ability” to do so. Serbia is listed as not having “provided or committed to provide training” to Ukrainian troops.

Sending weapons to Ukraine would represent a significant departure from Belgrade’s public position — and remained off the table, Vucevic said. “Serbia has not and will not sell any complex combat systems, armaments, assets or weapons to Russia or Ukraine throughout the duration of the conflict,” he said.

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Dozens of highly classified documents have been leaked online, revealing sensitive information intended for senior military and intelligence leaders. In an exclusive investigation, The Post also reviewed scores of additional secret documents, most of which have not been made public.
Who leaked the documents? Jack Teixeira, a young member of the Massachusetts Air National Guard, was arrested Thursday in the investigation into leaks of hundreds of pages of classified military intelligence. The Post reported that the individual who leaked the information shared documents with a small circle of online friends on the Discord chat platform.
What do the leaked documents reveal about Ukraine? The documents reveal profound concerns about the war’s trajectory and Kyiv’s capacity to wage a successful offensive against Russian forces. According to a Defense Intelligence Agency assessment among the leaked documents, “Negotiations to end the conflict are unlikely during 2023.”
What else do they show? The files include summaries of human intelligence on high-level conversations between world leaders, as well as information about advanced satellite technology the United States uses to spy. They also include intelligence on both allies and adversaries, including Iran and North Korea, as well as Britain, Canada, South Korea and Israel.
What happens now? The leak has far-reaching implications for the United States and its allies. In addition to the Justice Department investigation, officials in several countries said they were assessing the damage from the leaks.

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Vucevic appeared to leave open the possibility that Serbian weapons could have ended up in Ukraine through third-party countries and without his government’s involvement. “There is always the possibility that some weapons might mysteriously appear on the territory where there is a conflict, but it has absolutely nothing to do with Serbia,” he said. “That is a question for the countries that do not conform to international norms or terms of business agreements.”

Serbian weapons export deals include provisions that forbid buyers from transferring the goods to third parties without Serbian approval — and the Belgrade government cannot be held responsible for any violations of those rules, the Serbian Defense Ministry said in a statement sent by email.

The document leak comes just a month after Belgrade publicly denied reports in Russian media outlets that Serbian-made rockets had ended up in Ukraine. Maria Zakharova, a spokeswoman for Russia’s Foreign Ministry, said at the time that Moscow was “deeply concerned” and called the allegations “an extremely important matter indeed for the bilateral relationship,” state media reported.

One year of Russia’s war in Ukraine

Portraits of Ukraine: Every Ukrainian’s life has changed since Russia launched its full-scale invasion one year ago — in ways both big and small. They have learned to survive and support each other under extreme circumstances, in bomb shelters and hospitals, destroyed apartment complexes and ruined marketplaces. Scroll through portraits of Ukrainians reflecting on a year of loss, resilience and fear.

Battle of attrition: Over the past year, the war has morphed from a multi-front invasion that included Kyiv in the north to a conflict of attrition largely concentrated along an expanse of territory in the east and south. Follow the 600-mile front line between Ukrainian and Russian forces and take a look at where the fighting has been concentrated.

A year of living apart: Russia’s invasion, coupled with Ukraine’s martial law preventing fighting-age men from leaving the country, has forced agonizing decisions for millions of Ukrainian families about how to balance safety, duty and love, with once-intertwined lives having become unrecognizable. Here’s what a train station full of goodbyes looked like last year.

Deepening global divides: President Biden has trumpeted the reinvigorated Western alliance forged during the war as a “global coalition,” but a closer look suggests the world is far from united on issues raised by the Ukraine war. Evidence abounds that the effort to isolate Putin has failed and that sanctions haven’t stopped Russia, thanks to its oil and gas exports.

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