Iranian President Ebrahim Raisi said on Thursday that theIslamic Republic will have a “harsh and regrettable response” to any “mistake” committed by Washington or its allies. US President Joe Biden and Israeli Prime Minister Yair Lapid signed a joint pledge on Thursday to deny Iran nuclear arms, a show of unity by allies long divided over diplomacy with Tehran. “The great nation of Iran will not accept any insecurity or crisis in the region and Washington and its allies should know that any mistake will be met by a harsh and regrettable response from Iran,” Raisi said during a speech. Washingt…