DENVER – The so-called six-party talks – the on again, off again international mechanism by which the United States, China, Russia, South Korea, and Japan negotiate with North Korea over its nuclear aspirations – are often cited as an example of multilateral diplomacy. In fact, the talks have served as a platform for addressing a host of issues that range far beyond the North Korean nuclear problem, in the process nurturing interlocking, interrelated bilateral relationships in the region.