Explainer-What challenges could stand in the way of a final US-Iran deal?

As U.S. and Iranian negotiators convene in Switzerland, they grapple with significant obstacles that could jeopardize a long-awaited peace agreement. Key issues include Iran's nuclear program, regional security concerns, and the U.S. sanctions regime. These challenges reflect deep-seated mistrust and geopolitical complexities that have plagued relations for decades. The outcome could have far-reaching implications for regional stability and global non-proliferation efforts, making this negotiation crucial on both a local and international scale.