U.S President Barack Obama meets with Costa Rica's President Laura Chinchilla (R), in San Jose, capital of Costa Rica, on May 3, 2013. (Xinhua/POOL)

Costa Rica's President Laura Chinchilla (L) and U.S President Barack Obama (2nd L), greet children as they arrive to the Foreign Ministry in San Jose, capital of Costa Rica, on May 3, 2013. (Xinhua/POOL)

U.S President Barack Obama meets with Costa Rica's President Laura Chinchilla (R), in San Jose, capital of Costa Rica, on May 3, 2013. (Xinhua/POOL)