ROBIN EMMOTT THE United Nations has urged international donors to pledge up to $10 billion to help Syrians fleeing a decade of civil war in the midst of the COVID-19 pandemic, saying that the need for humanitarian support has never been so great. In the fifth annual conference to keep Syrians from starvation, the event hosted by the European Union is seeking $4.2 billion for people inside Syria and $5.8 billion for refugees and their hosts in the Middle East. Some 24 million people need basic aid, a rise of 4 million over the past year and the highest number…