Obama-Biden's worst foreign policy aggression against the world was the so-called Iran Nuke Deal, officially denominated the JCPOA. In eight years of sanctimonious hypocrisy and bloodthirsty Realpolitik in foreign affairs, the JCPOA was the poisoned cherry at the crown of the cake. We could point to other Obama-Biden offenses: the encouragement of the Muslim Brotherhood [an Islamic supremacy movement notorious for massacres of native Christian Copts in Egypt inter alia], the racist demand of Israel to stop letting Jews make their homes in Judea-Samaria beyond the Green Line [parts of the Jewish National Home erected under international law by the San Remo Conference and the League of Nations], encouraging the aggressive Turkish Islamist dictator, Recep Tayip Erdogan [who tirelessly threatens war and incites war against Israel and other eastern Mediterranean and Caucasian neighbors, etc], and so forth and so on. But all in all, the Iran Nuke Deal that allowed Iran to keep working towards a bomb because the JCPOA lacked an effective inspection regime, plus it had a "sunset" clause that would let Iran openly continue to work for a bomb or increase its numbers of nuke bombs after eight years, plus a gift for Iran's insincere agreement to the Deal of a mere $150 billion [including a billion or so in cash, allowing Iran to surreptitiously fund its terrorist cats paws in Lebanon, Iraq, Syria and Yemen], seems the most dangerous for the world.
Biden took willing, perhaps eager, part in these destructive, warmongering policies. It was Biden who came to Jerusalem to promote the policy of apartheid against Jews in Judea-Samaria ["West Bank"], while Zbigniew Brzezinski --Jimmy Carter's national insecurity advisor-- traveled to Damascus during the 2008 presidential election campaign to let the bloody Bashar Assad know that if Obama were elected, he would have a friend in the White House. So Biden too was morally responsible for the Obama-Biden administration's foreign policy aggressions, while Biden's foreign policy [or "national security" staff] openly boast of going back to the JCPOA from which President Trump had withdrawn. Despite their planned Afghanistan fiasco in August 2021, the Biden foreign policy team still want to make it easier for Iran to achieve its longed for Bomb. They and their supporters claim that somehow a new agreement with Iran to stop working for a nuke Bomb will stop Iran from getting that nuclear bomb. But treaties do not enforce themselves and Iran has already violated the JCPOA in letter and spirit.
We also know that in the 1990s, the USA under Bill Clinton negotiated a nuclear bomb freeze with North Korea. The Communist dictatorhip of North Korea was supposed to not make a nuclear bomb, according to that agreement with Clinton's administration. But guess what!! North Korea now has a nuclear bomb. The agreement with Clinton and his team did not in fact prevent North Korea from getting the Bomb. Even worse for the JCPOA, some of Clinton's team when he made the acccord with North Korea are now back and working on nuke negotiations with Iran [such as Wendy Sherman] as part of Biden's team. Only a fool could believe that either a new and improved JCPOA or a wholly new agreement wth Iran would actually prevent the fanatics in Teheran from getting The Bomb.