FILE - Tourists ride classic convertible cars on the Malecon beside the United States Embassy in Havana, Cuba, Oct. 3, 2017. The Pentagon confirms that a senior Defense Department official who attended last years’ NATO summit in Lithuania had symptoms similar to those reported by U.S. officials who have experienced “Havana syndrome." The syndrome is a still-unexplained set of symptoms that includes piercing head or ear pain. Current intelligence assessments have found that it is unlikely that Havana syndrome attacks were conducted by a foreign adversary. But intelligence agencies have varying degrees of confidence in that assessment. (AP Photo/Desmond Boylan, File)
FILE - NATO Secretary General Jens Stoltenberg, right, speaks with United States President Joe Biden during a meeting of the NATO-Ukraine Council during a NATO summit in Vilnius, Lithuania, July 12, 2023. The Pentagon confirms that a senior Defense Department official who attended last years’ NATO summit in Lithuania had symptoms similar to those reported by U.S. officials who have experienced “Havana syndrome." (AP Photo/Pavel Golovkin, File)