hit. the president of yemen s refused to sign a deal with opposition leaders to step down. the agreement had been brokered by make states. the ministers failed to convince fail the president. barack obama arrives in ireland today at the start of his visit to europe. as part of his trip he s going to visit the home of his great great great grandfather. i m zain vergee in london. world business today starts now. good afternoon from cnn hong kong, i m andrew stevens. and a very good morning to you from cnn london, i m nina dos santos and this is world business today. from sink ronrow nized swim, the imf hangs out the hiring sign. and a world business today today exclusive, the mwe have t internal e-mail. another huge plume of volcanic ash shuts down iceland s air space is spreading towards the united kingdom. before all that we have a sell-off going on in the markets. asian shares down heavily. we ll have those numbers in just a moment s time. let s begin with
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