President Castro was a friend of India. The people of India admired him for his struggle for the liberty and progress of his people, Mukherjee said in a message to Raul Castro Ruz, the President of the Councils of State and Ministers, the Republic of Cuba.
"It was with great sadness that I received the news of the passing of your brother and Former President of Cuba, President Fidel Castro Ruz, Leader of Cuba's Revolution. Please accept my heartfelt condolences," the President said.
"He has long been a towering figure on the world stage, including at the helm of the Non-Aligned Movement (NAM).
"We shall always cherish President Castro's personal contribution to the close relations between India and Cuba. Memories of President Castro's visit to New Delhi for the NAM Summit in 1983 are still fresh in our minds. India mourns with the people of the Republic of Cuba," Mukherjee said.
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"He had true personal relationship with former Prime Ministers Jawaharlal Nehru and Indira Gandhi.
"As leader of the NAM, Fidel Castro made immense contribution and worked with India side-by-side. Since the success of his revolution in Cuba in 1959, India was one of the first countries to recognise diplomatically Cuba after the revolution," Mukherjee said.
Cuba's government has announced that Castro's ashes would be interred on December 4 in the eastern city of Santiago, the birthplace of his revolution.