BERLIN/BRUSSELS : Fraudsters have offered 400 million doses of Covid-19 vaccines worth some 3 billion euros to European Union countries, two officials, showing how criminals seek to capitalise on a botched inoculation campaign weighing on the bloc's economic recovery.EU leaders will discuss by videoconference on Thursday how to protect their 450 million citizens from new, more contagious variants of the coronavirus, ensure stable vaccine deliveries, ramp up production and update jabs to counter new strains.Two officials with the bloc's executive European Commission estimated that around 400 million doses of "ghost" vaccine had been offered by fraudsters at a price of up to €3 billion ($3.67 billion)."There is a really large quantity," one.