The proposal, offered by President Oscar Arias Sanchez, would directly affect not only Nicaragua but other countries, too.

President Oscar Arias Sanchez of Costa Rica could have written them yesterday.

The negotiations were to be based on a peace plan offered by President Oscar Arias Sanchez of Costa Rica.

Calderón was due to assume office on May 8, for a four-year term, succeeding President Oscar Arias Sanchez.

He is President Oscar Arias Sanchez.

That plan is named for its author, President Oscar Arias Sanchez of Costa Rica.

Costa Rican President Oscar Arias Sanchez, the principal author of the peace plan, returned home to a jubilant welcome.

"I'm very proud," President Oscar Arias Sanchez of Costa Rica said today.

President Oscar Arias Sanchez led the celebrants through unbelievably crowded streets, where I too was a spectator.

The new plan is based on a proposal originally made by President Oscar Arias Sanchez of Costa Rica.