The secret backstory of how Obama let Hezbollah off the hook
Both Hezbollah and Iran continued to build up their military arsenals and move thousands of soldiers and weapons into Syria. Aided by the U.S. military withdrawal from Iraq, Iran, with the help of Hezbollah, consolidated its control and influence over wide swaths of the war-ravaged country. Iran and Hezbollah began making similar moves into Yemen and other Sunni-controlled countries. And their networks in Africa trafficked not just in drugs, weapons and used cars but diamonds, commercial merchandise and even human slaves, according to interviews with former Project Cassandra members and Treasury Department documents. Hezbollah and the Quds force also were moving into China and other new markets. But Project Cassandra's agents were most alarmed, by far, by the havoc Hezbollah and Iran were wreaking in Latin America.
This is a long article but well worth reading. "Project Cassandra" tells the story of what Obama was prepared to do to secure the Iran deal.