A World Trade Organization panel, ruling in favor of Brazil in a landmark challenge, found the United States has not done enough to bring cotton subsidies in line with international trade rules, a US official said.

"The Panel found that the changes made by the United States were insufficient to bring the challenged measures -- certain support payments under the 2002 farm bill and export credit guarantees -- into conformity with US WTO obligations," the trade official said, speaking on condition of anonymity.

"We are very disappointed with these results. We continue to believe that payments and export credit guarantees under our programs are now fully consistent with our WTO obligations," the official said. (Reuters)