A woman walks past a poster making reference to Argentine President Cristina Fernandez de Kirchner and YPF oil company, controlled by Spain's Repsol but declared by the Argentine government on the eve as subject to expropriation, in Buenos Aires, on April 17, 2012. Spanish Prime Minister Mariano Rajoy said on Tuesday at the World Economic Forum on Latin America in the Mexican Pacific resort of Puerto Vallarta, that Argentina's decision to expropriate Spanish oil giant Repsol's subsidiary YPF mars the country's "good understanding" with Spain. The poster, with the initials of Fernandez de Kirchner and a logo of YPF, reads "They Are Ours. They Are Argentine."    AFP PHOTO/DANIEL GARCIA (Photo credit should read DANIEL GARCIA/AFP/Getty Images)