Chinese premier Li Keqiang began a three-day visit to Brazil on Monday. He has pledged US$50 billion in infrastructure investment ahead of next's years Olympic Games in Rio de Janeiro. Brazil is the first stop in the Chinese leader's four-nation tour that will also takes him to Colombia, Peru, and Chile. The tour is designed to strengthen Beijing's ties to the region and promote Chinese investment in energy, hydroelectric power, and an ambitious railway project. teleSUR