No he didn’t. Obama enriched the tyrannical Iranian regime and enabled them to proceed with a nuclear weapons program and fund their proxy terror groups including Hamas and Hezbollah. After the Obama deal's sunsets and lax enforcement, Iran’s recent sprint to 60% enrichment and massive 440 kg stockpile its proxy wars, and attacks that preceded the February strikes—while praising temporary JCPOA caps that left infrastructure intact and didn't touch missiles or Hezbollah. Trump’s ceasefire addressed the hard issues (stockpile, enrichment, verification) into 60-day talks after degrading capabilities with force and reopening the Strait; it's no grand victory, but neither was Obama's paper deal that Iran later violated. Real costs in lives and oil prices occurred on both "diplomacy" and "strikes" paths because Iran chose escalation.