Iranian drone attacks on CIA facilities in the Gulf have prompted U.S. intelligence analysts to investigate whether Russia assisted by providing targeting information or advanced drone technology, said four people familiar with U.S. intelligence. These people, who spoke on condition of anonymity to discuss national security matters, said U.S. intelligence officials have not yet reached firm conclusions about the possible Russian involvement in the attacks on CIA facilities. But they cited the strikes' effectiveness and apparent precision, as well as Russia's broader technical support for Iran, as possible evidence. Reuters and other media have reported — and U.S. officials have...