PoliticsOPINION: Pemex left in the lurch by Mexico's governmentPresident Andres Manuel Lopez Obrador's strategic vision for Pemex is doing serious damage to the company, and Mexican contractors are suffering tooPoliticos: Pemex chief executive Octavio Romero Oropeza (left) and President Andres Manuel Lopez Obrador put their heads together over the oil questionPhoto: PEMEXGareth ChetwyndLondon