How to pronounce “diversionary” in English

They get it ready by June 1. And on June 5, there's a message that they receive from Hitlerthat he's sending to his army commander in Normandy named General Irwin Rommel. And Hitler tells Rommel, if there is an invasion of Normandy, it will be a diversionary tactic and do nothingfor five days. The real invasion will occur later, somewhere else. The message is decrypted at Bletchley