Secretary of State Hillary Clinton this week accomplished a diplomatic feat that her immediate predecessors tried but failed repeatedly to pull off: visiting South Korea, but skipping Japan and China on the same trip. It may sound immaterial, but defying protocol is a tricky thing in diplomacy, especially in Asia.

For years, I’ve been very amused when the State Department would send us in the traveling press corps a note about the secretary plans to visit just South Korea or just China or just Japan. Every time, I’d smirk and bet that he or she would end up going to all three countries — and I was right. That had become a tradition — the Japanese in particular considered it an affront to be ignored by their staunchest ally in favor of Seoul or Beijing.