By Alexandra Valencia QUITO (Reuters) – Ecuador expects to pull together a trade deal with China at the end of this year and will begin formal debt re-negotiations with the Asian country, Ecuadorean President Guillermo Lasso said on Saturday, after a Beijing visit with his counterpart Xi Jinping. China became Ecuador’s top lender over the last decade, with millions of dollars in long-term credit tied to the handover of crude oil, large investments in hydro-electric and mining projects and other loans. “In China we had a productive meeting with President Xi Jinping,” Lasso posted on Twitter. “W…