Russian President Vladimir Putin has begun a six-day tour in Latin America, with a stop in Cuba, a key Soviet ally during the Cold War backs Moscow in its dispute with the West over Ukraine.
Russian companies will participate in petroleum projects around Boca de Jaruco on the island's north coast, and that co-operation will extend to offshore oil deposits, Cuban government website Cubadebate (in Spanish) said.
Cuban state media carried photos in the evening of Mr Putin's meeting with retired leader Fidel Castro. Mr Putin and Raul Castro also participated in a ceremony at Havana's Memorial to the Soviet Internationalist Soldier.
Its oldest stars died after a late burst of international fame, but the show will go on for just a little while longer as Cuba's trademark Buena Vista Social Club as the iconic band prepares to say "adios" with a final global tour.
Some 15 years after the release of their first recording and their historic show at Carnegie Hall, vocalist Eliades Ochoa conceded the Grammy-winning band was due for retirement.
Many of the musicians were brought out of retirement and obscurity during a legendary recording session in March 1997 produced in Havana by American guitarist Ry Cooder.
The 'Adios' farewell tour kicks off in France in July before taking in countries such as Spain, South Africa and the United States.
Former Cuban President Fidel Castro made a surprise appearance at the opening of a Havana cultural centre sponsored by one of his favourite Cuban artists.
State television broadcast images of the bearded, grey haired Cuban leader arriving at the cultural centre to the applause of local residents.
The reclusive 87-year-old was last seen in public in April 2013 at the inauguration of a school in Havana.
Castro lives in a villa on the outskirts of Havana where he regularly receives guests, but photos are rare and only occasionally do his writings appear in the local media.
Castro governed the Caribbean island for 48 years before falling gravely ill in 2006 and handing power to his brother Raul Castro, who officially became president in 2008.
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Cuban President Raul Castro is speaking at the memorial service for Nelson Mandela.
He described Mandela as the "ultimate symbol of dignity and unwavering dedication to the revolutionary struggle for freedom and justice".
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Diana Nyad has become the first person to swim from Cuba to Florida without a shark cage on her fifth attempt.
US veteran long-distance swimmer Diana Nyad tried to smile for the cameras after completing her 110-mile journey from Cuba to Florida without a shark cage.
Ms Nyad, whose face was swollen, was placed on a stretcher and hydrated with an intravenous drip before being taken to hospital by ambulance.
Diana Nyad managed to stand unaided as she arrived at Smathers Beach in Key West after swimming for almost 53 hours.
The 64-year-old has become the first person to complete the swim from Cuba to Florida without using a shark cage.
US veteran long-distance swimmer Diana Nyad swam approximately 110 miles from Cuba to Florida in 52 hours, 54 minutes and 18.6 seconds, her support team announced.
They wrote on her Twitter account: