A few reasons why China's vaccine diplomacy, which has been successful so far, may get into difficulties: -China needs to produce large quantities of the vaccine in order to vaccinate the planned 40% of its population by the end of June. This fact will reduce the number of vaccines China can share with others. -There are doubts about the efficiency of the Chinese vaccines when it comes to the new Coronavirus variants. China's fast and efficient start of vaccine diplomacy may see setbacks in the coming months, as its competitors, especially the USA, will have more capacities to share vaccines with the rest of the world.