Spanish and Portuguese prime ministers on Saturday signed a contract to further promote the construction of bullet train rail links between the two countries, and agreed to improve cross-border cooperation.

Spanish Prime Minister Jose Luis Rodriguez Zapatero and Portuguese Prime Minister Jose Socrates met at the end of a two-day summit which focused on illegal immigration, the European Union's stalled constitution, and plans for an all-Iberian electricity grid.

The two leaders signed contracts on jointly building two high-speed rail links between Spain and Portugal, and to set up a research and development center to work in the area of nanotechnology.

They also agreed to strengthen cross-border security in order to prevent illegal immigration into Europe.

Source: Xinhua