US military said it flew B-52 bomber over Middle East 'to deter aggression' It was the first such flight since President Joe Biden took office last week Move comes amid tension with Iran over its nuclear and military ambitions Biden's predecessor, Donald Trump, pulled US out of 2015 nuclear deal with Iran Biden has said he is willing to re-enter agreement if Iran adheres to its terms Iran, meanwhile, refused demands by deal's opponents to renegotiate terms Last week, Iran's military held massive drills along coast of Gulf of Oman