rich edson is live for us in vancouver where the summit is taking place. rich, they're expected to talk strategy and how to isolate north korea, right? >> right, trace. this is a way to try to circumvent or prevent north korea from circumventing united nations sanctions and perhaps a naval blockade to ensure that north korea is further isolated per the u.n. sanctions. rex tillerson is on his way from washington d.c. he's arriving this evening in vancouver, canada. ahead of the meetings, he will have discussions this evening with the canadian foreign minister and his counter parts from japan and south korea. the state department says the united states and canada invited countries that joined the u.s. effort in the korean war more than 60 years ago. that means china and russia were not invited and will not be here. china accounts for 90% of north korean trade. the state department says it has coordinated with those governments ahead of the meeting