Zimbabwe Econony Spiraling Downward

http://news.bbc.co.uk/2/hi/africa/6913148.stm

Zimbabwe, once a comparatively stable African nation, is seeing food shortages, unemployment, and monetary crises as inflation has risen 5,000%. Just imagine if inflation was 5,000% in the US; chaos would ensue. No wonder refugees are fleeing Zimbabwe (at almost 3,000 per day). In the article, a quotation from the president of Zimbabwe mentions that Zimbabwe's enemies are making sanctions on goods to increase inflation. I don't understand who those enemies could be and how their actions could cripple Zimbabwe so dramatically. With 4 million people needing food aid, something has got to be done.