The tensions, confirmed by a Quito source, could bring into question Mr Assange's position in the South American nation's London embassy if they remain unresolved - more than a year after he claimed asylum there in order to avoid extradition to Sweden, only to be prevented from leaving by British police. Ecuador's President Rafael Correa is said to have been angered by WikiLeaks' part in Mr Snowden receiving a letter guaranteeing him safe passage.