US President Donald Trump has dismissed the prospect of Iran returning to negotiations, saying he is unconcerned about whether Tehran comes back to the negotiating table.
Trump has warned that Iran would face significantly heavier attacks if hostilities continue, saying it would be targeted at a "much harder and higher level".
Iran's Supreme Leader Mojtaba Khamenei, meanwhile, has issued his first public message since fighting resumed following a month of relative calm.
Khamenei said Iran's armed forces had "unforgettable lessons" in store for the United States, signalling that Tehran intends to continue resisting the renewed American military campaign.
UAE condemns Iranian attacks
The United Arab Emirates has condemned what it described as "hostile attacks by Iran" targeting Bahrain, Jordan and Iraq's semi-autonomous Kurdish region.