Washington’s top diplomat Mike Pompeo was addressing Vietnamese business leaders but his real audience was not in the Hanoi dining room. The U.S. Secretary of State was sending a message from the thriving commercial heart of this once war-torn city all the way to North Korea. Vietnam fought a brutal war to expel American invaders, but now the former foes enjoy burgeoning trade ties and a cautious but real friendship. And, whether talking at a business dinner or walking the bustling shopping streets of old Hanoi, Pompeo wants Kim Jong Un to know it. If only North Korea were to surrender its nuclear arsenal, he suggests, it too could grow rich like its fellow one party state Vietnam. Addressing business leaders, Pompeo said that U.S.-Vietnam trade had grown 8,000 percent in the past decade, as it rose to relative prosperity. “I say all of that because it’s important, but I hope that the United States, that one day we can share the same relationship with North Korea,” he said. Last month U.S. President Donald Trump met Kim in Singapore at a historic summit designed to open a diplomatic route outside of conflict. The meeting culminated with the leaders signing a…