Uh...Scott
There's a difference between a coalition to fight a war and coalition to negotiate an agreement. In the former, mulitple forces add value and capacity. It the latter, multiple mouths add agendas and confusion.
Fact is, the current six party negotiations have achieved nothing. As the situation in Iraq worsens, so too does the situation in North Korea, which is now fully capable of handing over nuclear materials and technology to terrorists.