UK's Cameron: Syria, Russia must show chemical arms proposal is genuine

LONDON (Reuters) - British Prime Minister David Cameron wants Russia and Syria to demonstrate that a Moscow-backed proposal for President Bashar al-Assad to put his chemical weapons under international control is genuine, Cameron's spokesman said on Tuesday. "The onus is very much now on the Russian government and the Assad regime to follow up in a way to show that the initiative is a serious and genuine offer," the spokesman said, adding many serious questions remained to be answered. (Reporting By Andrew Osborn; Editing by Guy Faulconbridge and Stephen Addison)