Iran's offer of a three-way summit meeting of the presidents of Iran, Iraq and Syria could be welcome, but Iran's Islamic government has a history of saying the right thing and doing something else, the United States said Monday. State Department spokesman Tom Casey said the decision whether to follow up must come from Iraq, not the United States. He said, however, that Iran and Syria will have to change their behavior before such a meeting could be productive. "Certainly we welcome continued discussion and dialogue," Casey said. "I think the thing that has concerned us, and still does concern us, is the fact that while there have been positive statements from the Iranian government about wishing to play a positive role in Iraq, those statements haven't been backed up by actions." The same goes for the Syrians, Casey said.