The 30th summit of the Gulf Cooperation Council, meeting in Kuwait this week, expressed its solidarity with Saudi Arabia in its fight with the Shi'ite Houthi rebels in northern Yemen. The Kuwaiti emir noted that Saudi Arabia is facing "flagrant aggression that targets its sovereignty and security by those who have infiltrated its territory." The formerly little-noticed conflict between the Houthi rebels and the Yemeni government is now taking on the coloration of an additional hot front in an ongoing region-wide cold war. The conflict in northern Yemen reveals the ongoing Iranian regional effort to convert Shi'ite populations into assets...