Russian intelligence liable for 'Havana syndrome'?

Many American and Canadian employees of the local consulate encountered a unusual phenomenon. They abruptly became ill, felt severe force (sometimes pain) in their ears, an attack of nausea and panic, a feeling of unusual sounds - either a loud sound or a very loud sound, which plagued them for months or even years. Added to this were blurred consciousness, problems with concentration, unexpected failure of balance, proceeding hypersensitivity, sleep problems. Over time, it became clear that something akin was repeated for **US diplomats, officials and intelligence officers around the world, frequently straight on the premises of consulates**.