United Nations sanctions are set to be reimposed on Iran later on Saturday - a move Tehran has warned will be met with a harsh response - over accusations the country has violated a 2015 deal with world powers that aimed to stop it developing a nuclear bomb. The end of the nuclear deal originally negotiated by Iran, Britain, Germany, France, the United States, Russia and China is likely to exacerbate tensions in Middle East, just months after Israel and the US bombed Iranian nuclear sites. "In past days and weeks, Iran has put forward multiple proposals to keep the window for diplomacy open. Iran said on Saturday it was recalling its ambassadors to Britain, France and Germany for consultations. Iran's economy is already struggling with crippling sanctions reimposed since 2018 after US President Donald Trump ditched the pact during his first term.