Experts say backing Iran’s ethnic communities could ‘open up a hornet’s nest’ and increase risk of chaotic civil warIntense waves of airstrikes have hit dozens of military positions, frontier posts and police stations along northern parts of Iran’s border with Iraq in what appears to be preparation by US and Israel for a new front in their war.A US official with knowledge of the discussions between Washington and Kurdish officials said the US was ready to provide air support if Kurdish peshmerg...