Amid fresh strikes, what does diplomacy between the U.S. and Iran entail?

U.S. forces struck Iranian boats and missile launch sites in southern Iran on Monday, in what U.S. Central Command spokesperson Capt. Tim Hawkins has called "self-defense strikes ... to protect our troops from threats posed by Iranian forces." Iran says it shot down three U.S. drones. Despite the violence, neither Iran nor the United States appear to be pull…