The document discusses trust between Iran and Western powers regarding Iran's nuclear program. It outlines two approaches to trust - rationalist, based on self-interest, and binding, based on maintaining relationships. The Brazil-Turkey-Iran agreement showed more trust in Iran by allowing it to send low-enriched uranium to Turkey, but the US rejected this. The agreement demonstrated changing power dynamics as middle powers like Brazil and Turkey work with others to resolve issues. Building trust with Iran through agreements could encourage compliance with non-proliferation goals.