U.S. President Barack Obama and Cuban President Raul Castro will share the same stage on Friday in an encounter rich with symbolism as their countries set aside decades of mistrust and attempt to restore diplomatic relations.
The rapprochement is set to dominate the Summit of the Americas meeting, held in Panama, less than four months after they announced they would seek to lower tensions and boost trade and travel between the two Cold War enemies.
Obama and Castro spoke by phone on Wednesday before the U.S. leader left Washington, a White House official said. They have separate agendas for most of the day but will both attend the start of the summit along with other regional leaders on Friday evening.
Apart from a couple of brief, informal encounters, the leaders of the United States and Cuba have not had any significant meetings since Castro's older brother Fidel Castro toppled U.S.-backed dictator Fulgencio Batista in a 1959 revolution.
But the two countries' top diplomats - U.S. Secretary of State John Kerry and Cuban Foreign Minister Bruno Rodriguez - held talks at a Panama City hotel on Thursday night, the first meeting of its kind since the United States' John Foster Dulles and Cuba's Gonzalo Guell got together in Washington in 1958.
Sitting face-to-face in a room visible through a large glass window, Kerry and Rodriguez talked for over two hours. A senior U.S. State Department official described it as a "lengthy and very constructive discussion" and said they made progress.
Obama appears to be close to removing Cuba from the U.S. list of countries that it says sponsor terrorism. Cuba's inclusion on the list has exacerbated tensions and made it harder for U.S. companies to do business with Cuba.
The State Department has now recommended that Cuba be taken off the list, a U.S. Senate Foreign Relations Committee aide said on Thursday.
Obama is expected to agree, although it is not clear whether he will announce his decision during the summit.
A U.S. official said Kerry and Rodriguez used their meeting to smooth the way for Cuba's removal from the list. The United States has pushed for Cuban assurances of no future support for terrorism, and Cuba has made the same demand of Washington.
Striking Cuba from the list would move the two countries closer to renewing full diplomatic relations, broken off by Washington in 1961, and would be popular in Latin America, where governments have pushed Washington for years to change its Cuba policy.
Widespread praise in the region for Obama's new Cuba policy was tempered last month, however, when his administration imposed sanctions on Venezuela, Cuba's closest ally and main benefactor. That controversy now hangs over the summit, which ends on Saturday.
Venezuelan President Nicolas Maduro says he will present Obama with a petition signed by millions of people demanding that the sanctions be reversed. He is certain to receive support from Castro and other left-wing leaders in Latin America.