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Fidel Castro surfaces in new photos with Argentine president

Argentina's Press Office via AP

Argentina's President Cristina Fernandez, left, talks with Cuban leader Fidel Castro, right, and Fidel's wife Dalia Soto del Valle during a private meeting, on Sunday, Jan. 26, 2014 in Havana, Cuba.

Argentine President Cristina Fernandez met with a frail-looking Fidel Castro on Sunday while in Cuba for a regional summit, posting pictures of the two smiling together on her Twitter account.

Castro, who has rarely been seen in public since he handed power to his brother Raul in 2006, was wearing one of his customary tracksuits in the photos. In one shot, Castro appears to be signing photos of himself for Fernandez.

Argentina's Press Office via AP

Cuban leader Fidel Castro and Argentina's President Cristina Fernandez look at a collection of photo portraits of Fidel during a private meeting, on Sunday, Jan. 26, in Havana, Cuba.

Fernandez wrote on Twitter that Castro had invited her to lunch along with his daughter, Florencia. She said she was “enchanted” by the meeting and, offering a glimpse of the meal conversation, said the two leaders shared “infinite nostalgia” for the late Hugo Chavez.

Fernandez is in Havana to attend the second Summit of the Community of Latin American and Caribbean States (CELAC). Castro is holding private meetings with some of the heads of state in town for the meeting in an unofficial capacity.

The two-day summit, perhaps ironically, coincides with the 50th anniversary of when many Latin American countries broke diplomatic and economic ties with Castro’s government.

NBC's Mary Murray contributed to this report from Havana.