Russian naval vessels have arrived in Cuba’s capital Havana for a harbour visit. The arrival of the frigate Admiral Gorshkov was greeted with a 21-gun salute off the coast of the Caribbean island nation, local media reported on Wednesday. A nuclear submarine was also sighted off the coast. Havana is only around 170 kilometres away from Key West in the US state of Florida. According to the Cuban government, the reason for the visit from June 12 to 17 is the historic friendship between the two countries. However, US media reported that Russia was planning military exercises in the Caribbean. A R…