"Classified Pentagon documents leaked, causing concern for US officials"

Leaked classified US intelligence documents suggest infighting between Russian officials, including some within the Federal Security Service (FSB) and Defense Ministry, over Russia's casualty count for the war in Ukraine. The documents also reveal US monitoring of Russian intelligence and military command, which could put sensitive sources at risk. The leaks have already altered some of Ukraine's military plans, and the Pentagon has launched an investigation into the leaks. The Kremlin has expressed doubts about the reliability of the reports.