U.S. spies caught Russian intelligence officers boasting that they had convinced the oil-rich United Arab Emirates “to work together against US and UK intelligence agencies,” according to a purported American document posted online as part of a major U.S. intelligence breach. U.S. officials declined to comment on the document, which bore known top-secret markings and was viewed by The Associated Press. The Emirati government on Monday dismissed any accusation that the UAE had deepened ties with Russian intelligence as “categorically false.”

But the U.S. has had growing concerns that the UAE was allowing Russia and Russians to thwart sanctions imposed over the invasion of Ukraine. The document viewed by the AP includes an item citing research from March 9 with the title: “Russia/UAE: Intelligence Relationship Deepening.” U.S. officials declined to confirm the document’s authenticity, which the AP could not independently do. However, it resembled other documents released as part of the recent leak.