The US envoy to the United Nations criticised the level of international support for nations hit by Ebola as she began a tour today of west African nations struggling with the disease. Samantha Power said before arriving in Guinea that too many leaders were praising the efforts of countries like the United States and Britain to accelerate aid to the worst-affected nations but were doing little themselves. 'The international response to Ebola needs to be taken to a wholly different scale than it is right now' Power told NBC News before boarding her plane. She said many countries 'are signing