Royal Dutch Shell Plc negotiators met on Monday with the union representing workers at U.S. refineries as a strike stretches into a third day after talks on a new national contract broke down. A United Steelworkers spokeswoman said no progress was made toward a new agreement after the two sides discussed the issues. Contract talks broke down on Sunday with workers asking for higher wages against a backdrop of crude prices that have plunged nearly 60 percent since June, prompting oil companies to cut spending.