Russia's GRU’s Unit 29155, a secretive intelligence unit may have been responsible for cases of 'Havana Syndrome', a medical condition reported by US and Canadian government officials and military personnel primarily in overseas locations, according to the findings of a CBS News documentary teams's five-year-probe with The Insider and Der Spiegel.

Russia's secret intelligence unit responsible for spreading 'Havana Syndrome' in US, Canada: Report

Intelligence agencies in the United States (US) concluded on Wednesday (March 1) that it was very unlikely that Havana Syndrome, the mysterious illness which affected American officials, was caused by a foreign actor.

Explained: US intel says very unlikely that foreign powers caused Havana Syndrome. But what is it?

The world of diplomacy is filled with the usual diplomatic tussle. The sparring diplomats try tricks in their games of one-upmanship. But addling with abilities of rival diplomats with spycraft and equipment?

Havana Syndrome strikes again? What is it exactly?