While in Zambia on a three-nation tour through Africa, US Treasury Secretary Janet Yellen accused China of being a barrier to concluding negotiations to resolve Zambia's significant debt problem. The Chinese Embassy in Zambia responded that the US should solve its own domestic debt issues and not make groundless accusations against others. What is Zambia's debt crisis? What has been China's role in helping to alleviate debt pressure? And how can Zambia and other African countries emerge from defaults?