is that between Cuba and South Africa.
Here's Nelson Mandela in Cuba:
"The real truth is that the West supported apartheid; they supplied it with technology, countless billions in investments, and vast quantities of arms; and they also gave it political support. No, imperialism did not break ties with apartheid, it did not blockade apartheid; imperialism maintained and continues to maintain excellent relations with apartheid.
It was Cuba that had to be blockaded, Cuba where the vestiges of apartheid -- that is, racial discrimination -- disappeared a long time ago. Cuba had to be blockaded as punishment for its revolution, as punishment for its social justice -- but never apartheid. "We come here with a sense of great debt that is owed to the people of Cuba. What other country can point to a record of greater selflessness than Cuba has displayed in its relations with Africa?
"Where is the country that has sought Cuban help and has had it refused? "How many countries under threat from imperialism or struggling for national liberation have been able to count on Cuban support?"
http://www.greenleft.org.au/back/1991/38/38p21b.htm More than 300 South Africans studying medicine in CubaGranma, Aug 4
"THIS year we are celebrating 10 years of freedom, and it is thanks to the Cuban government and people, who have been with us through the difficult years of our revolution," affirmed Thenjiwe Ethel Mtintso, ambassador of the Republic of South Africa in Havana. She was speaking at a ceremony to bid farewell to 32 South Africans who have studying medicine for five years in Cuba and will do their internships at universities and hospitals in their country.
Mtintso emphasized that this was the third group of students to have completed the course, and urged them not to forget the sacrifices signified by Cuba’s internationalist aid to the revolutions in Angola and South Africa.
"Remember who you are and where you were educated, and we hope that you will be revolutionary doctors who will serve the people," she added.
The ambassador announced that before 1994, more than 2,000 South African students had graduated in Cuba, and many others, "including myself, came for political education."
She quoted Che Guevara, who in addressing medical students in 1960 said, "we have the right, and even the obligation of being before all else, revolutionary doctors, who put their knowledge to the service of the Revolution and the people."
http://www.granma.cu/ingles/2004/agosto/mier4/32sud.html