Major shipping companies still see transiting the Strait of Hormuz as "very risky" and say there's little appetite to resume normal operations through the vital waterway until more details of the U.S.-Iran deal become clear. Multiple companies say firm security guarantees are needed, despite an assurance from President Trump of a "totally safe, secure, and pristine" route through the strait. The U.S. and Iran are set to sign a memorandum of understanding Friday in Switzerland that will formally