Some of the largest Gulf oil producers, including Saudi Arabia and the United Arab Emirates, are seeking to sign a written treaty with the United States under which the U.S. could provide defense support after attacks from Yemen have intensified, Bloomberg reported on Wednesday, quoting sources with knowledge of the proposal. Ideally, the major oil exporters in the Arab Gulf would seek a formal treaty with the United States, the sources told Bloomberg, but expanded and revised bilateral defense support agreements could also work, one of the sources…