Presidents Evo Morales of
They are all opposed to
Castro described the accord as "an extraordinary document with profound humanitarian, social and economic content".
"Now, for the first time, there are three of us," Castro said.
"I believe that, one day, all [Latin American] countries can be here."
Morales said upon arrival in Cuba on Friday: "It will be a great meeting of three generations of revolutionaries, of people representing the three revolutions that we still have to broaden."
The Bolivian leader expressed confidence that the treaty would help promote "fair trade, trade that generates jobs, ensures living standards and defends human dignity".
The initiative promoted by Castro and Chavez is an attempt to thwart US plans for the Free Trade Area of the Americas (FTAA).
The three presidents call the FTAA a
The mini-summit of leftist leaders has been eyed with some concern in the region, as members of the Andean Community that includes
Luis Arce, the Bolivian finance minister, has already warned that