Iranian President Masoud Pezeshkian issued a stern warning, stating Iran's response to any aggression would be "harsh and regrettable." This statement follows US President Donald Trump's threat that the US would take action if Iran revives its nuclear program or ballistic missile development. Trump indicated the US would support Israel if Iran advanced its nuclear capabilities. The article also mentions past US strikes on Iranian nuclear facilities and Trump's mediation of a Gaza ceasefire deal.